MF-101 Lowpass Filter
Contents
1. distortion When the light is yellow some low order distortion may be audible giving the sound a subtle warm analog quality When the signal is strong enough to drive the light into the red the distortion at the output becomes stronger and more distinctly audible Watch this light when you set the DRIVE control for the desired effect Simplified Block Diagram of the MF 101 EXPRESSION PEDALS AND VOLTAGE CONTROL You now know what each of the rotary control knobs does to the sound of the MF 101 With the exception of DRIVE each knob has an expression pedal input which duplicates its effect This enables you to plug in up to four expression pedals to play the MF 101 with your feet as well as with your hands The moogerfooger EP 1 Expression Pedal is designed for this purpose Or you can use expression pedals with equivalent specifications See the Technical Information section on Page 12 for more information on pedal specifications When you plug an expression pedal into one of the pedal inputs on your MF 101 the pedal adds to the effect of the corresponding control For example let s say that you plug an expression pedal into your MF 101 s CUTOFF input With the pedal all the way back the cutoff frequency of the filter is set by the CUTOFF knob Then when you advance the pedal the cutoff frequency of the filter goes up just as if you turned the CUTOFF knob up So a good rule to follow is when you use an expression pedal you set th2. setup emphasizes your dynamics without producing strong coloration It s good for playing fast lead lines The pedal brings the effect in and out AMOUNT 6 MIX 10 CUTOFF 250 RESONANCE 0 minimum coloration to 6 a little coloration ENVELOPE SWITCH FAST MODE SWITCH 2 POLE brighter 4 POLE more mellow EXPRESSION PEDAL to AMOUNT or no pedal at all Guitar Screaming Dynamic Wah The Resonance is turned way up The filter produces its own tone which your instrument tears up AMOUNT 6 MIX 10 CUTOFF 120 RESONANCE 7 on the edge to 9 screaming ENVELOPE SWITCH SMOOTH MODE SWITCH 2 POLE brighter 4 POLE more mellow EXPRESSION PEDAL to the CUTOFF jack Bass Deep Dynamic Tuba Wah The trick here is to turn the DRIVE control up far enough so that the LEVEL light is in the red while you re playing At the same time turn down the gain control on your amp AMOUNT 4 MIX 10 CUTOFF 60 120 RESONANCE 0 2 for tuba sound 7 for overdrive wah ENVELOPE SWITCH SMOOTH MODE SWITCH 2 POLE brighter 4 POLE more mellow EXPRESSION PEDAL to the CUTOFF jack Theremin or Sax Talking Lead With RESONANCE turned up to 6 or 7 your instrument s sound has an expressive vocal quality as you play alternately loud and soft With RESONANCE turned down your instrument s brightness builds up and dies down as you play alternately loud and soft Set your theremin s tone to maximum brightne
3. specifications current at the time of shioment for a period of one year from cate of purchase During the one year period any defective products will be repaired or replaced at Moog Music s option on a return to factory basis This Warranty covers defects that Moog Music determines are no fault of the user RETURNING YOUR MF 101 FOR REPLACEMENT REPAIR You must obtain prior approval and an RMA number from Moog Music before returning any product to us call 828 251 0090 Wrap your MF 101 carefully and pack it with the power adaptor in its original carton The warranty will not be honored if the product is not properly packed Then send it fo Moog Music UPS is recommended with transportation and insurance charges paid A reasonable cost for service and for materials and return freight will be charged to replace materials defective through the fault of the user or for which the one year warranty period has expired Transportation and insurance charges from Moog Music to your United States address of products repaired or replaced under warranty will be paid by Moog Music Notes MOOG MUSIC Inc 554C Riverside Drive Asheville NC 28801 PHONE 828 251 0090 FAX 828 254 6233 EMAIL info moogmusic com WEB ADDRESS htto www moogmusic com MF 101 SPECIFICATIONS DESCRIPTION Analog Effects Module incorporating two functions a voltage controlled lowpass filter and an envelope follower FRONT PANEL FEATURES CUTOFF rotar
4. ations per second when the knob is clockwise CUTOFF aice peat FREQUENCY THE CUTOFF KNOB OPENS AND CLOSES THE FILTER The RESONANCE knob changes the way the filter sounds Or in technical words it changes the shape of the frequency response When RESONANCE is near 0 the low overtones come through evenly When RESONANCE is turned up to around 7 the overtones near cutoff will be boosted creating a whistle like or vowel like quality When RESONANCE is above 8 the filter actually produces its own tone at the cutoff frequency That tone interacts with your instrument s tone when you play your instrument through the filter zZ 0 3 4 IRES 4 We IA RESE 7 erect a an S FREQUENCY THE RESONANCE KNOB CHANGES THE SHAPE OF THE FILTER RESPONSE The 2 POLE 4 POLE switch selects whether the signal goes through half the filter 2 pole or the entire filter 4 pole 2 POLE has a bright sound while 4 POLE has a deeper mellow quality GAIN 2 POLE FREQUENC THE 2 POLE 4 POLE SWITCH SELECTS THE FILTER SLOPE The Envelope Follower Section The AMOUNT knob the SMOOTH FAST switch and the ENV light are all part of the Envelope Follower section The AMOUNT knob determines how much the envelope signal is used to open and close the filter When the knob is counterclockwise the envelope signal has no effect on the filter When the knob is clockwise the envelope signal opens and close
5. e corresponding knob for the lowest value you want Then advancing the pedal increases that value The expression pedal inputs can also be used as control signal inputs This enables you to use your MF 101 with virtually any control signal source modular analog synthesizers MIDI to CV converters etc You will find information on interfacing your MF 101 with external control signal sources in the Technical Information section on Page 12 Your MF 101 has one control signal output jack It is labeled ENV OUT It may be used as a control signal source to control other voltage controlled devices including other moogerfooger analog effects modules The amplitude of the ENV OUT control signal is independent of the setting of the AMOUNT control or pedal A WARNING If you turn the RESONANCE knob past 8 the filter in your MF 101 will oscillate That is it will produce a tone of its own This is normal for a lowpass filter of this sort In fact synthesists have prized this effect for the past thirty years However you should be aware that it is possible to overheat your speakers if you set your MF 101 to oscillate and then leave it on a single frequency at high volume for an extended time With no pedal connected to the CUTOFF jack the oscillation frequency will be between 15 Hz and 12 kHz depending on the setting of the CUTOFF knob With a pedal or external control voltage plugged in to the CUTOFF jack it is possible to drive the oscillating f
6. e plugs These will short out the 5 7 volt supply to the ring contacts This voltage is current limited so you won t burn anything out but no pedal will work in any of the pedal control jacks if a tip sleeve plug is plugged into even one of the pedal jacks Applying a varying voltage to the tip terminal of a pedal control input jack has the same effect as turning the corresponding knob A voltage change of about 5 volts at the tip terminal is usually equivalent to turning the corresponding knob through its entire range You can program your MF 101 entirely from external control voltages by turning all four control Knobs but not the DRIVE knob counterclockwise and feeding 0 to 5 Volt programming voltages to the tips of the four pedal control input jacks AUDIO PATH Both the bypassed and the filtered signals go through voltage controlled amplifier circuits inside the MF 101 This is necessary to permit voltage controlled mixing and smooth clickless switching As a result the MF 101 will not pass an audio signal at all unless power is applied to it Another result of this arrangement is that the strength of the audio output signal depends on the setting of the DRIVE control even when the MF 101 is switched to BYPASS The nominal audio output level with the LEVEL light in the yellow is about 0 5 volts RMS LIMITED WARRANTY Moog Music warrants that its products will be free from defects in materials or workmanship and shall conform to
7. in your MF 101 work After that we ll give you some suggestions on how to use your MF 101 in specific applications At the end of this booklet you ll find technical specifications service and warranty information GETTING STARTED Here are some simple instructions on how you can quickly plug in and try out your MF 101 1 Unpack your MF 101 You can place it on a table or on the floor We suggest that you place it on a table while you become familiar with its features 2 Check that the power adaptor is rated at your country s standard power voltage 120 volts A C for the United States and Canada 100 volts AC for Japan and 220 volts A C for most other countries Plug the power adaptor s cord into the MF 101 s 9V jack Then plug the power adaptor itself into a power voltage receptacle 3 Note that the BYPASS light is on It will light up either red or green Red indicates that the MF 101 s filter is off line oypassed while green indicates that the filter is on line Pressing the stomp switch will toggle the BYPASS light between red and green For now leave the BYPASS light on red 4 Connect an instrument cable from the MF 101 AUDIO OUT jack to a line level input of your amp or mixer Turn the volume control on your amp down but not off 5 You can feed virtually any instrument level or line level signal through your MF 101 Examples are guitar bass keyboard theremin drum machine or Effects Send output on yo
8. led harmonics or overtones or partials They are what give the sound its characteristic tone color or timbre HARMONICS A TN STRENGTH OF HARMONIC FREOUENCY This spectrum graph shows the strengths of the harmonics in a sound A filter allows some frequencies to pass and cuts off other frequencies A Lowpass Filter is a kind of filter that allows all frequencies up to a certain frequency to pass and cuts off frequencies above that That frequency is called the cutoff frequency of the filter We ll call it the cutoff for short A lowpass filter removes the high frequencies from a tone It makes the tone more mellow or muted The lower the cutoff the more muted the tone sounds Imagine a window shade As it is pulled down it cuts out the higher light then the light from the middle of the window then finally all the light A lowpass filter does the same sort of thing with the sound spectrum CUTOFF I i FREQUENCY This frequency response graph shows that the gain of a lowpass filter drops off at frequencies above the cutoff frequency Your MF 101 contains a genuine classic four pole lowpass filter This kind of filter was first patented by Bob Moog in 1968 It is a big part of the Moog Sound of the 60 s and 70 s The effect has been imitated but never equaled by many instrument manufacturers Your MF 101 also contains a classic envelope follower An envelope follower tracks the
9. loudness contour envelope of a sound and produces a voltage that follows the dynamics of your playing Every time you play a note the envelope voltage goes up and then down The harder you play the higher the envelope voltage goes ENVELOPE OF THE SOUND TIME AUDIO WAVEFORM OF THE SOUND AUDIO WAVEFORM OF A MUSICAL SOUND TIME ENVELOPE SIGNAL OF THE SAME SOUND The Envelope signal follows the amplitude loudness of the sound which it represents The envelope follower output opens and closes the lowpass filter Think of the envelope voltage as an invisible hand that turns the CUTOFF knob up and down every time you play a note Since the envelope follows the dynamics of your instrument s signal you actually play the filter as you play your instrument TOURING THE PANEL FEATURES The Filter Section Let s look at the Filter section first The two control knobs are CUTOFF and RESONANCE The 2 POLE 4 POLE switch selects the filter s operating mode All three of these affect the sound of the filter The CUTOFF knob opens and closes the filter As we said above the filter lets through the low overtones and cuts off the higher overtones As the filter closes more and more of the high overtones are cut off The CUTOFF knob is calibrated in Hz vibrations per second The cutoff frequency is about 15 Hz when the knob is counterclockwise 500 Hz about an octave above middle C when the knob is in mid position and 12 kHz 12 000 vibr
10. m anann i ad FT F lt tt ted Understanding and using your moogerfooger MF 101 Lowpass Filter eor toy ae DRIVE na Ci o zori te 00 4 aa ORT T Pa Oa man a F lt Tat Welcome to the world of moogerfooger Analog Effects Modules Your Model MF 101 Lowpass Filter is a rugged professional quality instrument designed to be equally at home on stage or in the studio Its great sound and classic effects come from the state of the art all analog circuitry designed and built under Bob Moog s personal direction Your MF 101 is a direct descendent of the original modular Moog synthesizers It contains two complete modular functions a Voltage Controlled Lowpass Filter and an Envelope Follower All performance parameters are voltage controllable which means that you can use expression pedals MIDI to CV converter or any other source of control voltages to play your MF 101 While you can use it on the floor as a conventional effects box your MF 101 is much more versatile and its sound quality is higher than the single fixed function stomp boxes that you re probably accustomed fo You will find that your MF 101 is a deep musical resource It will give you an amazing variety of new sounds and will become your creative companion as you explore its functions The following pages will first tell you how to hook up your MF 101 and set the panel controls for the basic setup Next we ll explain how the modular functions
11. olts Power voltages in excess of 15 volts may cause serious damage to the MF 101 s circuit PEDAL INPUTS All pedal control input jacks are 1 4 tip ring sleeve phone jacks The sleeves are grounded and the ring terminals are supplied with 5 7 volts which is current limited to about 0 5 milliamperes The tip terminals receive the variable voltages from the pedals SHIELD Correct wiring of an expression pedal for the MF 107 An expression pedal for use with the MF 101 should contain a 50KW or 100KW potentiometer which is connected from the sleeve to the ring terminals The potentiometer wiper is connected to the tip terminal The pedal cable should be shielded with the shield connected to the sleeve terminal When connecting one or more pedal control input jacks to a source of external control voltage such as an analog synth or a MIDI to CV converter you should use patch cords with tip ring sleeve phone plugs The ring terminal on the plug should not be connected to anything so that the MF 101 s source of 5 7 volts is not shorted out APPLY 0 TO 5V EXTERNAL CONTROL VOLTAGE HERE TIP RING SLEEVE Correct wiring of a tip ring sleeve plug for connecting a pedal control input to a source of external control voltage Or if you do not plan to use any expression pedals with your MF 101 but would like to apply control voltages to one or more pedal control inputs you can use patch cords with regular two conductor tip sleeve phon
12. requency up as high as 40 kHz Some speaker systems especially precision studio monitors or audiophile speakers may be vulnerable to high volume steady tones at some frequencies within the MF 101 s range even frequencies that are too high or low to be audible You can protect your speakers by being aware of your MF 101 s output when the RESONANCE knob is at 8 or above Switch your MF 101 to BYPASS when you are not actually playing it ANOTHER WARNING Youll find that your MF 101 sounds really good You may be tempted to crank up the volume so you can really hear it That s OK as long as you keep a lid on those high frequencies 2 kHz and above that will stress your ears if they re amplified too much Like any high quality electronic musical instrument your MF 101 is capable of producing a wide range of frequencies It is up to you to use that frequency range in a careful and professional manner SOME TYPICAL SETUPS Here are some nice setups to start off with Experiment with all of them Try changing the knob settings with your hands Then plug in one or more expression pedals and try the same things with your feet Guitar Basic Lowpass Wah The expression pedal gives you extremely wide sweep range AMOUNT 0 MIX 10 CUTOFF 120 RESONANCE 5 normal wah 7 stronger wah ENV SWITCH Doesn t matter MODE SWITCH 2 POLE brighter or 4 POLE more mellow EXPRESSION PEDAL to the CUTOFF jack Guitar Hyper Punch This
13. s the filter as much as five octaves The SMOOTH FAST switch determines whether or not the envelope signal is smoothed out Some sounds like guitar chords have long rough envelopes and they often sound better if the envelope is smoothed out before going to the filter Other sounds like snare drum are quick and sharp and sound really good with the switch in the Fast position The ENV light shows how strong the envelope signal voltage is at any one time The stronger the audio input the brighter the ENV light will be Audio Input Level and Mixing The DRIVE and MIX controls and the LEVEL light are all part of the audio input level and mixing circuitry The DRIVE control adjusts the input gain With this control you can set the right input gain for virtually any instrument or line level signal source Turn this control counterclockwise for strong input signals and clockwise for weaker sound sources The DRIVE control is always active even when the MF 101 is in BYPASS mode The MIX control crossfades from the straight input signal to the filtered signal Use this control to get any mixture of filtered and unfiltered sound The LEVEL light tells how strong the input signal is after being adjusted by the DRIVE control As the signal level increases the light goes from off to green to yellow and finally to red Very weak signals do not light up this light at all When the light is green the signal is below the level that results in audible
14. ss Check out the effects wnen your theremin is producing subsonic pitches AMOUNT 6 8 MIX 10 or set it to O with expression pedal to MIX CUTOFF 250 500 or set it to 60 with expression pedal to CUTOFF RESONANCE 0 to 7 or set it to O with expression pedal to RESONANCE ENVELOPE SWITCH SMOOTH MODE SWITCH 2 POLE brighter 4 POLE more mellow Drum Machine Synth Drums Keep the rhythm going while sweeping the CUTOFF and or envelope AMOUNT Also experiment with turning up the DRIVE AMOUNT 8 MIX 10 CUTOFF 60 500 RESONANCE 6 8 or set it to O with expression pedal to RESONANCE ENVELOPE SWITCH FAST for punchy effects SMOOTH for whistling percussive effects MODE SWITCH 2 POLE brighter 4 POLE more mellow TECHNICAL INFORMATION NOTE The following information is intended for use by people who understand analog electronic circuitry and have enough practical experience to interconnect sophisticated electronic equipment correctly POWER The MF 101 works satisfactorily on 9 to 15 volts DC and uses about 100 milliamperes of current If your power adaptor shows up missing or inoperative you can power your MF 101 from any other power adaptor with a 9 volt or 12 volt rating and with the same power connector This must be 8V to 13V DC ai ies This is ground If you use a power source other than that which was supplied with the MF 101 be sure that the voltage never exceeds 15 v
15. t power adaptors power adaptor included GENERAL SPECIFICATIONS CASE Black panel with hardwood sides classic analog appearance DIMENSIONS 9 x 6 x 2 1 2 NET WEIGHT 2 lb SHIPPING WEIGHT 4 Ib including power adaptor and instruction manual POWER REQUIREMENTS 110 120 volt 5W 220 volt power adaptor available on special order MOOG MUSIC Inc 554C Riverside Drive Asheville NC 28801 PHONE 828 251 0090 FAX 828 254 6233 EMAIL info moogmusic com WEB SITE http www moogmusic com Entire Contents 1998 2003 MOOG MUSIC Inc
16. ur mixer Connect an instrument cable from your signal source to the MF 101 AUDIO IN jack Play your instrument or turn on the signal source Turn the DRIVE control clockwise until the LEVEL indicator lights up yellow most of the time 6 The BYPASS light should still be red Continuing to play your instrument adjust the volume control of your monitor amp until the loudness is comfortable Your instrument should sound clean and undistorted 7 Now set the MF 101 panel controls as follows MIX 10 CUTOFF 250 RESONANCE 6 AMOUNT 6 Left Switch SMOOTH Right Switch A POLE moogerfooger Omna FILTER Press the stomp switch The BYPASS light will now turn green Play your instrument Your instrument s signal is now going through the filter Listen to how the filter affects the quality of your instrument s tone Note also that louder tones open the filter more than softer tones 8 In the next section we ll explain exactly what the filter and envelope follower do and how the controls work For now get a feel for the controls by experimenting with different settings HOW A LOWPASS FILTER WORKS Let s start with some definitions so we re all talking the same language Sound is a vibration of the air The speed of vibration is called the frequency It is measured in Hertz Hz One Hz is one vibration per second We hear vibrations from 20 Hz to 20 000 Hz Musical sounds generally have many frequency components They re cal
17. y control which varies the filter s cutoff frequency over a nine octave range RESONANCE rotary control which varies the shape of the filter s response from pure lowpass to actual oscillation ENVELOPE AMOUNT rotary control which adjusts the amount that the input signal s envelope sweeps the filter cutoff frequency MIX rotary control which crossfades continuously from unfiltered to filtered audio DRIVE rotary control which adjusts the gain of the audio input SMOOTH FAST rocker switch which chooses between smooth and fast envelope follower response 2 POLE 4 POLE rocker switch which chooses between 2 pole bright and 4 pole deep filter frequency response LEVEL a three color LED that is used to set the DRIVE control ENV a LED that indicates the strength of the envelope voltage BYPASS a two color LED that tells whether the filter is on or bypassed ON BYPASS a rugged smooth acting stomp switch JACK PANEL FEATURES AUDIO IN 1 4 phone jack accepts any instrument level or line level audio signal from 16 dBm to 4 dom AUDIO OUT 1 4 phone jack 4 dBm nominal output level CUTOFF RESONANCE AMOUNT MIX all of which are stereo 1 4 jacks that accept moogerfooger EP1 or equivalent expression pedals or control voltages from either two circuit or three circuit 1 4 jacks ENVELOPE OUT jack delivers the Envelope Control voltage for use by other voltage controlled devices 9V POWER INPUT jack accepts standard 9 vol
Download Pdf Manuals
Related Search