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1. Major and Minor scales are all equal tenpered scales identical to what MIDI keyboards and most of western music uses However equal tenperament is a compromise that was designed to allow for easy key modulation at the expense of producing some intervals that are more dissonant than necessary especially major thirds Often a capella vocal groups will tend to sing harmonies that sound more pleasant by slightly altering the scale tuning from equal tenperament To achieve these natural tunings use the just intonation scales J ust Chromatic J ust Major and J ust Minor The Major and Minor Pentatonic scale are also in just intonation Hint To tune PitchDoctor to an existing track select and loop a single note from that track With Auto Correct enabled and a chromatic scale selected adjust the Tuning control until the Input Tuning Bargraph reads dead center or zero cents The other modes are a small selection of various ethnic scales with interesting intonations If we re missing one of your favorite scales let us know and we might be able to include it in the next release Tuning By default the keyboard is tuned to the reference tuning of A440 Hertz To tune to a different standard use the Tuning control The tuning control is adjusted in cents where 100 cents equals one semitone or half step Positive values will tune to a higher pitch and negative values will tune to a lower pitch For example a Tuning setting
2. can sound a bit unnatural The purpose of the Smoothing parameter is to smooth out these unnatural sounding pitch transitions Set Smoothing so that the transition sounds good to you The default setting usually works well for most applications Correcting Intonation Problems with the Pitch Keyboard For a single bad note by far the easiest way to fix it is to use the Pitch Keyboard to bang in the desired note and to record this as automation data with ProTools The procedure is similar to using the manual correct slider above but quicker and easier Start out using the default setting of PitchDoctor the setting that comes up when the plug in is first inserted The Auto Correct button should be disabled and the Manual Correct slider should be set at zero Leave the Shift Mode set to Conventional Make sure that Read is enabled in the Correction Score window To set up automation for pitch correction click on the automa tion button for PitchDoctor and enable automation for the Correction Score parameter Bring up the Pro Tools automation enable window and make sure plug in is enabled for automation In the track you re working on select auto write or auto touch to enable automation data to be written In Pro Tools locate and select the section containing the note or notes that you want to adjust It is helpful to set Pro Tools to Loop Playback Loop the selected section While the loop is playing click on one
3. of 50 cents would tune the keyboard to A440 plus one half semitone or about A453 Hz Manual Correct The Manual Correct slider is used to perform manual pitch correc tion or to add a constant pitch offset to any automatic correc tions made by PitchDoctor With this control you can alter the pitch of your audio track by 200 cents 2 semitones Dynamic changes to the Manual Correct amount are smoothed by the Smoothing control Input Tuning In Auto Correct mode the Input Tuning bargraph displays the tuning deviation of the input pitch relative to the closest note of the currently selected scale In Note Based pitch correction the tuning deviation relative to the selected note is displayed The bargraph displays a range of 200 cents which is equivalent to 2 semitones Negative values indicate that the input pitch is flat and positive values indicate that it is sharp Correction Amount The Correction Amount bargraph displays the total amount of pitch correction applied to the input signal The bargraph displays a range of 200 cents which is equivalent to 2 semitones In some cases the amount of pitch correction may exceed the range of this readout in which casethe maximum reading of 200 cents will be displayed Pitch Indicator The Pitch Indicator is a continuous readout of the input pitch and is displayed as a solid black circle above the Pitch Keyboard This is used as a rough visual indication of the
4. of notes on the pitch keyboard for the duration of the out of tune note The note will be corrected to the selected scale tone and automation event will be recorded into the Correction Score automation parameter If the note is very far out of tune you may need to increase the Capture range control setting Like using the manual correct slider the transition to the pitch corrected note can also be tweaked by using the Smoothing parameter Correcting Intonation Problems with Automatic Correction Automatic pitch correction is most useful for tracks that have many small pitch errors like some vocalists who may sing consis tently flat on certain notes This mode will not work very well if a singer is so far out of tune that he or she is actually closer to an incorrect scale degree than to the correct note To perform automatic correction Set Auto Correct to enabled Set Key to the key of the track to be corrected Select a Scale that matches the track to be corrected Usually this will be either Major or Minor If the song is not tuned to A440 adjust the Tuning parameter For automatic pitch correction the Scale setting is one of the most important controls for achieving good results In general the fewer notes that are in the selected scale the easier it will be for PitchDoctor to accurately detect and correct the track s pitch While it may be tenpting to simply set the scale to chromatic and quantize pitch to
5. your component plug ins If you purchased UltraTools or any of its component plug ins for the first time you must contact Wave Mechanics to register your product and receive the authorization appropriate to your platform Any of the plug ins can run fully functionally for 30 days until your authorization is completed f you have a Mac with the USB the iLok is the means of authorization If your Digidesign system does not already have an Lok key one can be purchase from Wave Mechanics at a nominal cost When you register your purchase with Wave Mechanics an iLok license card will be promptly sent to you to permanently authorize your plug ins Be sure to carefully remove the small license card 15mm x 25mm from the larger plastic card f you have an older pre USB Mac then the challenge and response codes are the appropriate means of authorization To obtain the challenge code while starting up Pro Tools or the authorizer application the challenge code will be displayed The challenge code can be copied and sent to Wave Mechanics by email support wavemechanics com if your purchase is already registered with Wave Mechanics or along with your registration Be sure to include the product name and serial number as listed on your product registration card along with the challenge code Aresponse that permanently authorizes your plug ins will be promptly returned f you have an iLok and the iLok license card for the plug ins y
6. User Guide PitchDoctor TDM Version 2 7 PITEHDOC OR First Aid for Out of Tune Vocals Created by Ken Bogdanowicz Robert Bristow Johnson and Bob Belcher License Agreement By purchasing this package you are hereby granted the right to use this copy of this softw are subject to the following restrictions You may not copy or distribute any copies of this software or documentation with the exception of copies made for back up purposes We still retain all rights to this software meaning that by purchasing this soft ware you can use it but we still own the code algorithms designs copyrights patents and anything e se related to this software You agree not to reverse engineer this product You understand that this softw are may not be free of bugs or errors We ve done our best to make sure that the software is bug free but sometimes bugs happen Weare not liable for any damage caused by this software whether it s trashed files or trashed recording sessions We don t expect this to happen but you can t be too careful Back up your data regularly IN ANY CASE OUR LIABILITY IS LIMITED TO THE AMOUNT THAT YOU PAID FOR THIS SOFTWARE That said we want you to be happy with this software If you have a problen with this product tell us and we will try to correct the problem If we can t correct the problem and you choose to retum the product we will refund your money without giving you a hassle This manu
7. al and PitchDoctor software Gropyright 1998 2002 Wave Mechanics Inc Wave Mechanics the Wave Mechanics logo and PitchDoctor are trademarks of Wave Mechanics Inc Pro Tools is a registered trademark of Digidesign Inc Wave Mechanics Inc PO Box 528 Burlington VT 05401 www wavemechanics com e mail supportO w avemechanics com fax 802 951 9799 phone 802 951 9700 Contents Chapter 1 Getting Started A ges eof aaa amp EAC 1 System REQUIFEMO NES 25 ii cs teewseddus serca rinda 2 A E ets a ee oad Hee wel 2 Chapter 2 Using PitchDoctor oe ee ee eee ee ee eee re ee ee rere Tere eer 7 Block Dagram oratoria ia 10 OIETUISWS sixerc nsrsiilra ridad 11 Pitch Control Ml srest ciate heed cere ise Abe da sosa 12 Auto Orre A 12 Pitch Keyboard stos tea isis ra A tence z 13 escoria A S4 15 A 15 TM ss ir oe 16 Manual Or aeei y repta ek shaded deh he x 16 NUE TUNG ccrorrvarrio miis 16 Credion AM scada ey diy ode See ee 17 io AAA 17 QuantiZing Control Panel cece cece 17 AMOUNT iivacerians reg a4 dees od ea eevee eden ob ee 17 SMOOEMN A clawdwiwa gh oneee Eeo Bede 18 A oes des ee obs es ee hae acs eee ens 18 A ante ott cette auton ava a a iad 19 A A O 19 Formant Preserving cc cece eee e cece eee eee eee e eens 20 Score Control Panel 2 20nd sak oia dpi tee See dbase 20 Correction COMO isa trici es srrerades titiri bowers be sad 20 Generate yeer tice hence ATE E thokeseeeeceews anus 21 a a in
8. efulness of this technique when correcting rapidly changing note sequences Read The score Read button enables or disables the reception of auto mation data for the Correction Score parameter This has been included so that you can disable the reception of Correction Score automation without deleting all of the automation data for this The Read control must be enabled for PitchDoctor to respond to Correction Score automation data Status Panel Delay The Delay readout indicates the approximate processing delay through the PitchDoctor plug in To compensate for this delay within Pro Tools simply nudgethe source material ahead by the value shown in this display Bypass When the red Bypass LED is illuminated PitchDoctor is in the bypass state meaning that it simply passes the audio signal without modifying it in any way Bypass is toggled with the control B keyboard shortcut for Windows just B or by pressing the bypass button above the PitchDoctor control pand the gray area above the PitchDoctor control panel contains the Pro Tools controls that affect the operation of this plug in Chapter 3 Doing Real Stuff with PitchDoctor Correcting Intonation Problems with the Manual Correct Slider To spot fix an individual note or to adjust an entire section that s flat or sharp the most accurate and flexible method is to use the manual correct slider and to automate its setting with Pro Tools This is fairly painle
9. en be edited and used for automation driven Note Based pitch correction This feature might be used in cases where automatic pitch correction is having difficulty accurately tracking the pitch To generate a score follow this procedure Clickon the automation button for PitchDoctor and enable automation for the Correction Score parameter Bring up the Pro Tools automation enable window and make sure plug in is enabled for automation In the track you re working on select auto write or auto touch to enable automation data to be written Auto Quantize In Pro Tools locate and select the section containing the section of audio that you want to create a score from Make sure that Loop Playback in ProTools has been disabled Click on the generate button The LED will flash displaying the message hit play Start playback in ProTools at which point the message will change to Analyzing After playback has stopped the LED will flash again and the message hit play will appear Sart playback again and Correction Score automation data will be written for the selected section of your track After the score has been recorded you will have a segment of automation data that can then easily be edited to create a reliable source for pitch correction note data Keep in mind that in the current version of Pro Tools the automa tion data has a fairly large amount of timing uncertainty and that this may limit the us
10. es oe peel Re he cake es oe UK eee ea See 22 Status Panel A ate EKE EPE REE NENE E aO Ei 23 Delay viscorcorivinie dera br ra edi Pa 23 o AAPADU0Uo0 D Z uve ee yikes eRe 34 ceed ee oan E 23 Chapter 3 Doing Real Stuff with PitchDoctor Correcting Intonation Problems with the Manual Correct Slider 0 00 cee eee aes 24 Correcting Intonation Problems wth the Pitch Keyboard 25 Correcting Intonation Problems with Automatic Correction 6 ssas eaaa 26 Chapter 4 Common Problems Questions How Do I Get Finer Resolution on Parameter Adjustments ccc cece cece eee eee ees 28 How Do Return to the Default Value tor a Parameter Control oncrararri ra rana eRe 28 The Pitch Shifted Output Sounds Chopped Up or Glitchy 28 Pro Tools Says that the DSPs are Maxed out When Trying to Insert PitchDoctor 0 0 o 28 Chapter 5 Technical Support cee eee eee 29 Chapter 1 Getting Started Intro PitchDoctor is a professional quality pitch processing plug in that works within the Digidesign TDM environment It is designed specifically for correcting out of tune vocal and instrumental tracks It provides precise control over the amount of pitch shift making it easy to fine tune intonation where needed PitchDoctor also provides some automatic and semi automatic correction fea tures to make pitch correction easier faster and more accurate It is designed to detu
11. ives extremely precise control over the pitch correc tion applied However for vocals that have severe intonation problems this can also be somewhat tedious to use Note Based Pitch Correction is also used when Auto Correct is disabled and is accessed by using the Pitch Keyboard To correct an out of tune note in this mode click on one of the keys in the pitch keyboard while your track is playing When the pitch falls within the Capture range of the desired note it will be pulled in towards that note This mode is very useful for severe intonation problems and can even be used to change the melody of the original track To use Automatic Pitch Correction click on the Auto Correct enable button choose a key and scale and PitchDoctor will auto matically modify the pitch of any notes falling outside of the selected scale tones As enticing this sounds however automatic pitch correction comes with some major caveats In general automatic pitch correction will only work well on tracks that are slightly out of tune For more serious intonation problems PitchDoctor and any other automatic intonation correction tool will not be able to determine what the intended pitch is and will often try to correct the pitch to the wrong note However for the right kind of track this mode can save an incredible amount of time Pitch Control Panel PITCH DOCTOR 3 Auto Correct Scale Tun gt Custom 200 cents Auto Co
12. k is as dry as possible which means making sure that any reverb or other effects are inserted after PitchDoctor Try changing the shift mode to the Conventional pitch shifting mode Pro Tools says that the DSPs are maxed out when trying to insert PitchDoctor You ve run out of DSPs on your DSP farm card You must either remove some other DSP plug ins from your current session or add more DSP power by purchasing another DSP farm card from Digidesign Chapter 5 Technical Support Wave Mechanics offers free technical support for all registered users We love to hear from our users but if you are having problems first try to look in the manual for an answer Also check our web site for technical notes and product updates If you are still stumped please e mail us with the following info keep in mind that we won t be able to help you with questions about Pro Tools Apple or Windows NT hardware or software or any other non Wave Mechanics stuff The product version and serial number The version number of your Pro Tools system and type of hardware e g HD Mix classic PO or NuBus Your computer type and operating system version number e g system 9 1 etc A detailed description of the problem The e mail address for support is supportOwavemechanics com If you don t have access to e mail please fax the same info to fax 802 951 9799 If you don t have e mail or a fax you can call us a
13. ll run in Demo Mode for a limited period of time Install PitchDoctor Macintosh Exit from Pro Tools and any other applications that use the Digidesign DAE Insert the WaveMechanics Plug ins CD ROM into your com puter and double click the WaveMechanics installer applica tion Clickon the Continue button with the mouse when the initial splash screen appears Read the license agreement If you agree to these terms click the Accept button If you don t agree click Decline and the installation will be terminated Read the Read Me file for last minute updates and important information Gickon the Continue button In the installer dialog box select either the UltraTools product non authorized plug ins will run in demo mode or use the Custom Install option and select the PurePitch product and any other plug ins you wish to install In the installer dialog box select the drive on which to install PurePitch Select the same drive on which Pro Tools is installed In the installer dialogue box click on the Install button When authorizing any or all of the component plug ins of the UltraTools bundle the iLok USB key is used the older key disks are no longer used for authorization All Digidesign HD and current Mix and OOL systems ship with the iLok key If you have purchased an upgrade to UltraTools or any of its component plug ins a license card is included in the package and you can proceed to authorize
14. m the pop up menu gt Origintwe1s i no insert o inputi A METEO E IM e l PurePitch mong E arete JN gt al Each time this is done a new PitchDoctor processor is created You may create as many PitchDoctor processors as you want until you run out of DSP resources each processor uses one of the four DSPs available on the DSP farm card To access the control panel for PitchDoctor within Pro Tools click on the PitchDoctor insert button in either the Edit window or the M ix window Using PitchDoctor After clicking on the PitchDoctor insert button the control panel should appear as below Pitch Control Panel About Box Primary controls for performing Click the Wave Mechanics pitch correction logo to display program version hardware key serial number credits and other info PITCH DOCTOR Auto Correct Quantizing Amount Smoothing Sa Sensttivl l Shift Mode Panel Loge isul so 7 Selects the type of pitch ES shifting algorithm used e Score oe i for pitch correction Generate Read Quantizing Control Panel Score Control Panel Status Panel Controls for fine tuning the Controls for generating and reading Displays the bypass state pitch c orrection process automation data used in note based the current processing delay pitch correction and the hardware key status In the About Box accessed by clicking on the Wave Mechanics logo you ll see the program ve
15. nd most of the western world A blue button indicates that the note is altered from equal temperament You ll see blue notes in your scale if you ve chosen any of the just tempered scales the blues scale or any of the ethnic scales A light gray colored button indicates that the note is in the current scale but that no pitch correction will be performed when the input pitch is in the vicinity of that note Normally when the button is green or blue the pitch will be quantized to the scale tone To customize the scale click on one of the notes in the keyboard to cycle between the three possible button states e Not in the scale KEJ Gray Don t perform pitch quantization on this note Geen or Ly Blue Perform quantization on this note blue indicates non equal tempered tone Once a scale has been customized the scale button will change to indicate that the scale has been customized It will also indicate what type of intonation the custom scale is using For example if a standard equal tempered major scale is customized the cus tom scale will be equal tempered If a just intoned scale is customized the new custom scale will also be just intoned Scale customization can be recorded as automation data using the Custom Scale automation parameter When Auto Correct is disabled the keyboard will display all the notes as dark gray wells In this mode you can either use Manual Pitch Correction or Note Based Pitch Correc
16. ne or transpose vocal or instrumental tracks over a wide pitch range and still maintain the original natural sound PitchDoctor is completely real time which means you don t have to take a coffee break while the computer is chewing on your audio track Move the parameter knobs and hear the effect instantly System Requirements PitchDoctor is a software plug in for the Digidesign TDM envi ronment To use PitchDoctor you must have a Digidesign Pro Tools system version 5 0 or later equipped with TDM running on a Macintosh computer with OS 9 1 or later Each PitchDoctor processor uses one DSP chip on the DSP farm card Your current setup must have at least one free DSP of sufficient memory resource This manual assumes that you are familiar with the Digidesign Pro Tools TDM environment If you are uncertain about how DSP plug ins work within the TDM environment please read the Digidesign documentation and spend some time getting comfortable with the basic TDM system and the DSP plug ins that come with it before using this package Installation PitchDoctor software comes on a UltraTools CD ROM and uses an iLok USB hardware key device for software authorization The UltraTools CD ROM contains software for every current Wave Mechanics Pro Tools TDM plug in in the UltraTools family The PitchDoctor plug in that is authorized by the iLok will run without restriction whereas other Wave Mechanics plug ins not autho rized wi
17. ou wish to authorize simply start up Pro Tools or the autho rizer application for that product Displayed is a window with two button options Authorize or Quit Click on the Authorize button to authorize Confirm that Use license card is checked and click on Next gt If the license card is not inserted into the iLok you will be prompted to insert a valid license card for the plug in purchased then click on Next gt and your plug in is authorized If the installation completed successfully PitchDoctor should now appear in the inserts dialog box next time you start Pro Tools The installation should have installed the following on your computer A Wave Mechanics folder located in the directory you specified during installation containing a readme file the user manual and an authorizer program Acopy of the PitchDoctor plug in located in your Plug Ins folder located within your DAEfolder usually located in Program Files Digidesign The PitchDoctor settings files located in your Plug In Settings folder located within your DAE Folder f you are upgrading the previous version of PitchDoctor will be moved to the Removed Items folder within the Wave Mechanics folder Please take a moment to fill out the enclosed registration card Chapter 2 Using PitchDoctor Basics Within Pro Tools to process a track with PitchDoctor click on the Inserts button for that track and select PitchDoctor fro
18. pitch of the input rdative to the keyboard below and is useful when performing note based pitch correction Quantizing Control Panel Quantizing Amount Smoothing Capture Sensitivity 100 30 100 cent 10 Amount By default PitchDoctor will correct notes so that they fall exactly on the desired scale tone In some cases it may sound more natural to preserve some small deviations from perfect tuning The Amount control allows you to dial in exactly how much pitch correction will be applied A setting of 100 percent will result in perfect output pitch A setting of 50 percent will perform only half as much pitch correction leaving the output only half as out of tune as the original track A setting of 0 percent will perform no pitch correction 17 Smoothing The Smoothing parameter is used to limit the rate of change of the pitch correction amount Smoothing is applied to the automatically generated pitch correction and to the manual cor rection control With large values of smoothing the pitch correc tion amount will be limited to slow smooth changes Smaller values of smoothing will allow rapid changes in the amount of pitch correction In auto correct mode rapid pitch correction tracking can eliminate desirable vibrato and inflections from the original track Because of this larger settings of Smoothing are usually most desirable and will result in the most natural sound ing pitch correction Capture In no
19. rrect Click on the Auto Correct button to enable or disable automatic pitch correction Automatic pitch correction is enabled when this button is lit colored bright green To use PitchDoctor for manual or note based pitch correction make sure this button is disabled When using automatic pitch correction it is quite useful to auto mate this control to enable pitch correction for specific portions of a track Auto Correct does not appear as a parameter in the plug in automation window but it is automatable To automate the Auto Correct control select Correction Score from the plug in automation window The correction score is a special parameter that combines this control with note values from the pitch keyboard See the Correction Score description later in this chapter Pitch Keyboard The Pitch Keyboard is a one octave virtual keyboard that is used to control the automatic pitch correction features of PitchDoctor The function of the pitch keyboard will depend on the setting of the Auto Correct enable button When Auto Correct is enabled the keyboard will display the notes corresponding to the selected scale and key Notes that are in the selected scale will appear as green or blue buttons Notes that are not part of the scale will appear as dark gray depressions A green button indicates that the note is part of the 12 note per octave equally tempered scale which is the conventional scale used by MIDI keyboards a
20. rsion credits and other info Wave Mecha Wn e mec han igg c Release Version Number Block Diagram Below is a simplified block diagram showing the signal flow through the PitchDoctor processor PITCH SHIFTER OUT El MANUAL CORRECT AUTO CORRECT PITCH o DETECTOR Legend Summing Junction 2 signals added together Overview PitchDoctor is a powerful tool for correcting intonation problems with recorded vocal and instrument tracks The user interface was designed to be simple and intuitive and it hides much of the complexity of the processing being performed However please take some time to read this section carefully and to learn the different ways in which PitchDoctor can be used PitchDoctor can be used in three fundamentally different operat ing modes Manual Pitch Correction Note Based Pitch Correction or Automatic Pitch Correction The mode you choose to work with will usually depend on the type of material being corrected and on the severity of the intonation problems We suggest getting comfortable with all three operating modes because all of the modes will be useful in different situations Some tracks may even require a combination of all three types of pitch correction The simplest operating mode is Manual Pitch Correction and it s normally used when Auto Correct is disabled Simply use the Manual Correct slider to dial in the amount of pitch shift desired This mode g
21. s algorithm and may produce some objectionable artifacts Both algorithms have been designed so that at zero pitch shift no artifacts are introduced into the audio signal Since the automatic pitch correction modes only modify the audio during obvious pitched sections of audio the pitch shifting quality is also usually very good in either mode Conventional Conventional pitch shifting should be used when you are making small modifications in pitch roughly plus or minus 50 or 100 cents At larger shift amounts vocals may start to suffer from the chipmunk effect with this mode Usually this effect will be most noticeable if there are rapid variations in the pitch correction amount and will sound similar to a swept filter This mode should also be used with non vocal source material or material that doesn t shift well with the Formant Preserving option Formant Preserving The Formant Preserving pitch shift mode should be used if you need to shift the pitch of a vocal track by large amounts This mode will more faithfully preserve the character of vocal sources over larger pitch shift ranges However this mode is somewhat more proneto having difficulty with some source material If this is the case change the mode to conventional Score Control Panel Correction Score Score Control Generate ie Read The Correction Score parameter is a special automation param eter that only shows up in the Plug In Au
22. ss and is accomplished as follows Start out using the default setting of PitchDoctor the setting that comes up when the plug in is first inserted The Auto Correct button should be disabled and the manual correct slider should be set at zero Leave the Shift Mode set to Conventional To set up automation for pitch correction clickon the automa tion button for PitchDoctor and enable automation for the Manual Correct parameter Bring up the Pro Tools automation enable window and make sure plug in is enabled for automation In the track you re working on select auto write or auto touch to enable automation data to be written In Pro Tools locate and select the section containing the note or notes that you want to adjust It is helpful to set Pro Tools to Loop Playback Loop the selected section and adjust the Manual Correct parameter until the note or section is in tune Once you ve adjusted the pitch store this setting as automation data using Write Automation or the 8 Keyboard shortcut for WinNT use CH If you have to shift the pitch by more than 100 cents or if the timbre of the pitch corrected vocal sounds unnatural try setting the Shift Mode parameter to Formant Preserving Use whichever mode sounds better The transition to the pitch corrected note can be tweaked by using the Smoothing parameter in the Quantizing control panel If Smoothing is set to 1 the pitch transition will be nearly instantaneous which
23. t phone 802 951 9700 Finally if you are completely un wired you can write to us at Wave Mechanics Inc P O Box 528 Burlington VT 05401 Notes
24. te based pitch correction pitch correction will only be per formed when the input pitch falls within the Capture range of the selected note By default this range is 100 cents or 1 semitone If the input pitch is very out of tune or contains a large amount of vibrato it may be necessary to increase this setting so that pitch correction will be performed over a wider range Sensitivity PitchDoctor will only perform pitch quantizing if it is reasonably sure that the input audio represents a valid pitch Sensitivity controls how picky the pitch detector will be before it considers the input worthy of quantizing Higher values of this parameter will be more sensitive less picky and lower values will beless sensitive more picky Shift Mode PitchDoctor provides two different pitch shifting modes Conventional and Formant Preserving These are provided because each mode has different strengths and weaknesses Conventional mode provides the cleanest pitch shift quality but will give rise to the chipmunk effect for large amounts of pitch shift This effect is caused by awarping of the formant structure of vocal sounds The Formant Preserving mode will maintain the original character of the source vocal for larger shift amounts than Conventional mode However this algorithm is a bit more fragile and may have difficulty shifting certain types of material Typically very rough or raspy vocal sounds are more difficult to shift with thi
25. the nearest semitone this will often not produce acceptable results Often a vocalist will be out of tune enough or have enough vibrato to cause the pitch detector to choose the wrong chromatic interval If a major scale is used instead the pitch detector will have an easier job determining the intended pitch and will make less mistakes Often a consistent pitch detection error can be eliminated simply by customizing the scale It may even be useful to have different scales for different sections of a performance It may also be very useful to perform automatic pitch correction only on selected sections of a track This can be done by automat ing the Correction Score automation parameter When this param eter is enabled for automation it will record any changes made to the state of the Auto Correct enable button Chapter 4 Common Problems Questions How do get finer resolution on parameter adjustments Mac Hold down the key while dragging the parameter slider WinNT Hold down the Cid key while dragging the parameter slider How do return to the default value for a parameter con trol Mac Hold down the option key and click on the parameter con trol WinNT Hold down the Alt key and click on the parameter control The pitch shifted output sounds chopped up or glitchy First make sure that you are only trying to process a monophonic or single voice or instrument sound Also make sure that the trac
26. tion To use note based pitch correction click on one of the dark gray scale tones and a green button will appear When the pitch falls within the capture range of that note the key will light up and pitch correction will be active The note selection can be automated usingthe Correction Score automation parameter In either mode when the input pitch is within the capture range of one of the scale tones the corresponding key will be high lighted to indicate that pitch correction may be performed on that scale tone Key When Auto Correct is enabled the Key control sets the root or tonic note of the scale used for pitch correction Even when Auto Correct is disabled the Key and Scale settings have an effect on note assignment when Note Based Pitch Correction is used and a non equal tempered scale is selected Scale The Scale setting together with the Key are used in automatic pitch correction to determine how to alter the pitch of the input track While the scale control has many different modes to choose from for most applications in westem music the chromatic major and minor scales will be the most useful For example if the Key is set to C and the Scale is set to Major any pitch deviations of the input track from the key of C Major will be altered so that the result falls on one of the notes in the C scale The notes that make up the C scale will be displayed as green buttons on the Pitch Keyboard The Chromatic
27. tomation Window for PitchDoctor there is no Correction Score parameter on the con trol panel This parameter is used to automate the note selection in note based pitch correction and to automate the Auto Correct enable control By combining thesetwo parameters note based and automatic pitch correction may beused in different sections of a track The Correction Score control can have one of 14 discrete values No Correction Auto Correct and the notes G C D B By editing the automation graph associated with this parameter different regions of a track can have different types of pitch correction The following sequence of screenshots illustrates the use of the Correction Score parameter in the Pro Tools automation graph editor Quantize to No Quantize When the Correction Score value is set to a scale note C C etc PitchDoctor will perform note based pitch correction In the example above the first section of the waveform will be quantized to the scale tone A If Correction Score is set to No Quantize as in the second small section of the waveform no pitch correction will be performed When Auto Quantize is set as in the last part of the waveform PitchDoctor will perform automatic pitch correction using the current Scale and Key set tings Generate The Generate button is used to automatically generate correction score automation data by analyzing the pitch of your audio track This data can th

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