Shruti-1 user manual - Mutable Instruments
Contents
1. We call it ahem Sysexual reproduction 4 3 2 MIDI implementation The Shruti 1 understands the following MIDI messages e note on off e clock tick e play stop activates the step sequencer and arpeggiator e pitch bend and modulation wheel e a bunch of specific control changes portamento time release attack brightness harmonic intensity which are mapped to cutoff and resonance e SysEx patch transfer e some NRPNs Note that the NRPN implementation is rough and doesn t check the validity of the data so you might crash your Shruti 1 or trigger interesting side effects or secret waveforms by sending out of range values NRPN MSB is always equal to 0 You don t even need to transmit it Data Entry MSB is almost always 0 except for parameters which can take negative values or values above 127 Negative number are represented in 2 s complement For example the MIDI messages to send to set the Oscillator 1 range to 12 16 176 99 O NRPN MSB set to 0 176 98 4 NRPN LSB set to 4 from the table below Oscillator 1 range 176 6 1 Data Entry MSB set to 1 value above 127 or negative 176 38 116 Data Entry LSB set to 116 because 116 128 12 NRPN LSB Parameter Range 0 Oscillator 1 shape 0 12 1 Oscillator 2 shape 1 4 2 Oscillator 1 parameter 0 127 3 Oscillator 2 parameter 0 127 4 Oscillator 1 range 12 12 5 Oscillator 2 range 24 24 6 Modulator mode 0 3 7 Oscillator 2 detuning 0 127 8 Oscillator balanc2. s Cantarino is CPU intensive When you use this oscillator the sub oscillator and noise generator are switched off to handle the extra computational load 3 There s a very noticeable difference between the Square oscillator with pulse width 0 and pulse width gt 0 To give you the best sound the pulse width 0 case is read straight from a wavetable at full sample rate while the non zero pulse width case is an integrated blit which doesn t sound as good at half the sample rate So if you want to do PWM make sure it does not go to 0 or you ll hear the discontinuity Now you know why early digital analog hybrid synths JX8P ESQ 1 did not have PWM As for the operator parameter the different modulation modes are Operator Description What does the oscillator bal Applications ance parameter do 142 Mixing Adjusts the oscillator 1 2 bal Everything ance 1 gt 2 Mixing and synchronization Adjusts the oscillator 1 2 bal Psy trance Devo oscillator 2 s phase is reset ance whenever oscillator 1 s phase is reset You won t hear the detuning but instead a tim bral modulation 1 2 Ring modulation oscillators Nothing Bells Os Mutantes signals are scaled and multi plied 1 2 XOR modulation The bits Shifts the output with over This utterly fucks up the sig of oscillator s 1 and 2 digital flow nal and is relevant to any sit values are exclusive or ed and uation where a fucked up si
3. the aliasing is under control 2 2 6 triang Triangle A pure waveform which can create a good NES bass The waveshapping parameter controls which fraction of the waveform is zero ed out 2 2 7 cz Sawtooth with sweepable resonance This waveform is a simple imitation of the acid sounds produced by the Casio CZ 101 It uses a clever phase distortion sync trick to simulate a sawtooth filtered by a low pass filter with high resonance The frequency of the resonance is controlled by the parameter Using this oscillator you can simulate doubly filtered sounds or even formants 2 2 8 fm Minimal 2 operators FM The parameter controls the modulation strength This oscillator provides the base material for metallic sounds bells metallophones or the next 386 DX hit 2 2 9 8bits 8 bits A large range of harsh 8 bits sounding waveforms born from a dirty programming trick The parameter scans through the different waveforms which are perfect for trashy and chippy sounds 2 2 10 pwm Shameless square wave without anti aliasing 4 The parameter controls the pulse width Contrary to square this waveform stinks aliasing But you know what Below C2 we don t care and this sounds so fat But please don t use for leads sequences with notes above C3 unless you want that typical my first Arduino synth sound 2 2 11 noise Filtered noise generator W i Hit i The parameter controls the frequency of a simple 1 pole low pass high pa
4. 89 0 10 Q Pots are super nice for tweaking filters but not that great for selecting items in a long list or adjusting a BPM precisely If you find yourself struggling adjusting a parameter with the knob you can use the decrement increment buttons on the right The first button will decrease the value of the last parameter you ve touched by 1 unit the second button will increase this value by 1 unit The modulations step sequencer and patch load save pages are a bit different from the others we ll learn more about this later 2 Synthesis parameters 2 1 Architecture Let s start by the big architecture schematic showing the different sound generation modulation modification modules the Shruti 1 contain coarse coarse coarse pitch 1 vibrato PWM 1 pitchi vibrato balance PWM 2 pitch2 vibrato Sub oscillator Oscillator 1 Modulator Noise generator sub noise Audio in cutoff resonance gain level level Env 1 Env 2 LFO 1 LFO 2 cv 1 cv2 cv3 DC offset gt Digital audio signal gt Analog audio signal Random Mod wheel Bender g gt Analog control signal t Step Note Velocity Arpeggio A s E t gt Digital control signal t sequencer pitch gate Sounds complicated huh Step by step e The oscillators 1 and 2 generate basic waveforms which are combined together by the modulator Most of the time you ll simply mix them with a variable balance but s
5. beat With a x2 or xl rate square LFO mapped to the VCA you can get old school trancey gater effects With a x2 rate sample amp zhold LFO mapped to the cutoff and the basic arpeggiator pattern with high resonance you get a random bleeping at every note 2 2 20 Modulation matrix Remember this big schematics with all those parameters and modulation sources This page is where we connect the dots The first thing about this page is that it works a bit differently from the others The first knob allows you to select a patchcord while the knobs 2 4 allow you to edit it Let s see how it look mod src dst amt 1 ath 74 0 This page means The patchcord 1 connects the LFO1 to the oscillator 1 pitch and the corre sponding modulation amount is set to 0 If you turn the first knob you ll scroll through the different connections in place for example mod src dst amt 6 not cut 58 The patchcord 6 connects the note number to the filter cutoff and the corresponding modulation amount is 58 58 is what gave me the best pitch cutoff coupling it might depend a bit on your CEM though Once you have selected a patchcord with the first knob you can select its source destination amount with the 3 other knobs While you re editing the amount the Shruti 1 is super nice and shows you exactly what you are editing mod not gt cut amount The modulation sources are in modern lovers precise order 1 Ifol LFO1 output center
6. power up If a MIDI update was initiated wait for incoming SysEx firmware data Write the firmware and then reset for normal operation at the end of the transfer Otherwise check for data from a Serial programmer If no data is coming start the Shruti 1 for normal operation Otherwise read write chip data as instructed by the programmer The status of the bootloader can be monitored by the 12 front panel LEDs LEDs 1 8 behave as a progress indicator when uploading the firmware LED 9 is lit when waiting for MIDI data and blinks when MIDI data is received LED 10 is lit when a communication with a serial programmer STK500 has been initiated and blinks as data is received LED 11 is lit when a firmware update operation is in progress be it by MIDI or serial programmer LED 12 is lit for a short amount of time when the bootloader starts It is then lit in case of transmission error 18
7. save a patch e Turn knob 4 to the right to select save The cursor starts blinking to indicate we re in save mode e Turn knob 1 to select a memory slot e Use knobs 2 3 to edit the patch name e When the name is correctly set press the 5th group button again The Shruti 1 will go busy for a short while and the patch will be saved Otherwise any other action including turning the 4th knob to or pressing another group button would have not written anything in memory 14 3 2 Loading e Turn knob 4 to the left to select load e Turn knob 1 to browse the patch library e If you want to get back to the patch you were editing turn the knob 4 back to 4 Advanced topics 4 1 Long presses Some special functions can be triggered by pressing group buttons for more than 1s 4 1 1 Test note Press the keyboard performance group button the 4th one for more than 1s and release A C3 note will be played Press hold and release again to stop This is very useful when working on the firmware you can keep your hands on your computer keyboard 4 1 2 Performance page and Blinkenlights The performance page allows you to gather 4 parameters from different pages and put them altogether in a single page so you don t have to jump continuously from one page to another while performing To assign a parameter to one of the knobs in the performance page 1 Adjust the value of the parameter you want to import to the performance page 2 Hold
8. 1 Shruti 1 user manual Mutable Instruments There are two things you need to learn to use the Shruti 1 e How to use the interface and navigate through the different pages e What are the different synthesis parameters and how they affect sound But before that you ll also need to know how to plug in cables e Connect your synth computer s MIDI out to the Shruti 1 s MIDI in e Connect the Shruti 1 s Audio out to a mixer or sound card e You can use any 7 5V 9V power supply with a 2 1mm jack to power the Shruti 1 Make sure that it has a center pin positive outer collar negative pin connector With most universal power supplies you can select the polarity there s a little diagram on the connector showing you its polarity It should look like this o You can now power the Shruti 1 It should display the startup screen Controls and navigation 1 1 Controls Besides the on off switch the Shruti 1 provides the following controls e The output volume and input gain knobs e 5 group selection buttons e 2 increment decrement buttons e 4 general purpose knobs The current status of the synth is visualized through e 12 LEDs grouped by 3 1 4 3 1 e A 2x16 LCD display 1 2 Understanding the page and group system N N O D O 5 5 aa g OOUE gt 2 a a pes p GB uv 5 0o08 o0 v O y o Q gt OF202 35 50x SF FH GH ABTD GF oO WwW C c oO 0 Q O o0oE E ooo0o E BH Se 2 o0 O O OO
9. In case things go wrong and the Shruti 1 does not boot after the update don t panic You can power the Shruti 1 off and start again the entire operation You can also initiate a firmware update by holding the patch bank button for a couple of seconds two mississippis The screen will display 15 ready for os update And welcome to firmware update land Important An easy way of screwing up the firmware upload process is to play the update MIDI file from another position than its start or to increase the tempo thinking that this will speed up the process Don t do that 4 2 Easter egg There s an easter egg and you re gonna find it 4 3 MIDI 4 3 1 Patch reception and transmission Whenever you save a patch it is also transmitted to the MIDI out as a SysEx block You can record this into your favorite sequencer and replay it back The Shruti 1 will receive the data and this will become the current patch Warning When receiving a patch by SysEx the received patch is not written to patch memory it is only temporarily loaded in memory so you can edit it and if you re happy with it save it yourself There s no bulk patch load save from eeprom by SysEx Warning Tip since you don t risk overwriting stuff in memory when using SysEx patch transfer use it and abuse it For example embed at the beginning of each of your tracks a dump of the patch so your Shruti 1 will always recall the correct patch settings when you play it
10. OO OOO O ye ye ye 1 2 1 Pages The Shruti 1 has 4 knobs but this doesn t mean that there are only 4 sound synthesis parameters to tweak These knobs will control a different parameter depending on the current page Each page allows you to edit 4 different parameters related to one aspect of sound production For example on the Filter page you can edit the filter cutoff filter resonance envelope to filter modulation and LFO to filter modulation There are 12 pages as shown on the diagram above It s easy to know which page you are in First each LED indicator in the row of 12 LEDs corresponds to a page If the first LED is lit you are at the first page editing oscillator 1 Moreover the LCD display is constantly showing you which knob does what in the current page For example if you are at the filter page you can see cut res env lfo 110 0 10 0 1 2 2 Groups and navigation Alright so how do we move from one page to another By repeatedly pressing one of the 5 group buttons Each button allows you to cycle through related pages 1 Cycles through the oscillator 1 oscillator 2 mixer pages 2 Jumps to the filter page 3 Cycles through the envelope 1 envelope 2 Ifos modulations pages 4 Cycles through the arpeggiator step sequencer keyboard tuning pages 5 Jumps to the patch load save page It s easy to remember how the cycles are organized just look at the grouping of the LEDs they show you which p
11. ages are bundled with each other and they sit just on top of the button that cycles through them Let s take a simple example When you switch on the Shruti 1 the current page is the Filter page The 4th LED is lit and the synth is showing cut res env lfo 110 Oo 10 0 Press the 4th button this jumps to the arpeggiator page bpm oct pat swg 120 Oo 1 9th LED is lit Press this button again This brings the next page in the group the step sequencer step sequencer 0000ffffcccc4444 10th LED is lit Press again This brings the keyboard tuning page oct rag prt chn O equ 0 1 11th LED is lit Press again The 9th LED is lit and we re back to the arpeggiator bpm oct pat swg 120 oO 1 Now let s move to the oscillators Press the first button The 1st LED lights up and the display shows sha prm rng op saw 0 O 1 2 1 2 3 Editing parameters When a page is active the Shruti 1 shows you four parameters that can be edited You can simply adjust one of those parameters by turning the corresponding knob For example when the filter page is active cut res env lfo 110 Oo 10 0 You can turn the first knob to control the filter cutoff While you turn the knob the H 1 deep dives on this parameter and really tells you what it s all about no pesky abbreviation filter cutoff When you are done after a short time lapse the display gets back to showing the 4 parameters cut res env lfo
12. e 0 63 9 Sub oscillator volume 0 63 10 Noise volume 0 63 11 Sub oscillator shape 3 4 12 Filter cutoff 0 127 13 Filter resonance 0 63 14 Envelope gt cutoff modulation amount 0 63 15 Lfo gt cutoff modulation amount 0 63 16 Envelopel attack 0 127 17 Envelope2 attack 0 127 18 Envelopel decay 0 127 19 Envelope2 decay 0 127 20 Envelopel sustain 0 127 21 Envelope2 sustain 0 127 22 Envelopel release 0 127 23 Envelope2 release 0 127 24 Lfol Wave 0 3 25 Lfo2 Wave 0 3 26 Lfol Rate 0 127 27 Lfo2 Rate 0 127 28 3 n 1 Modulation source 0 15 29 3 n 1 Modulation destination 0 10 30 3 n 1 Modulation amount 0 63 70 Tempo 40 240 71 Arpeggiator octaves 0 4 72 Arpeggiator pattern 0 59 73 Clock swing 0 127 74 81 Step sequence 0 255 82 Octave shift 2 2 83 Scale raga 0 77 84 Portamento time 0 127 85 MIDI Channel 0 16 86 93 Patch name 32 127 94 Cycle length 1 16 4 4 Bootloader land Warning You really want to know The bootloader is a short piece of code that gets executed every time you power up the Shruti 1 or initiate an OS update It is different from the firmware no matter which firmware you put on the Shruti 1 by MIDI update the bootloader will always be there to allow you to revert your synth back to its original state The bootloader does the following things 17 Check if the Shruti 1 is powered up the normal way or if a MIDI update was initiated by a press on the patch bank button during
13. ed 2 Ifo2 LFO2 output centered 10 P a 10 11 12 13 14 15 stpseq Step sequencer output arp Arpeggiator gater this is a binary all or nothing control signal mwheel Modulation wheel value read from the MIDI in bender Pitch bend controller value read from the MIDI in centered offset A boring constant value Why would you want that It s more like a placeholder for future modulation sources cvl Control voltage read from the HACK_ME connector cv2 Control voltage read from the HACK_ME connector cv3 Control voltage read from the HACK_ME connector random Another random noise generator Mapped to the VCA makes for some super snares envl Envelope 1 velo Velocity of the last played note note Pitch of the currently played note centered gate Keyboard gater yet another binary control signal The modulation destinations are in modern lovers precise order 1 2 10 11 cutoff Filter cutoff vca VCA gain pwm i Oscillator 1 parameter can be pulse width but also waveshapping phoneme depending on the oscillator type pwm2 Oscillator 2 parameter can be pulse width but also waveshapping phoneme depending on the oscillator type oscl Coarse oscillator 1 pitch in a 16 16 semitones range Also affects the sub oscillator s pitch osc2 Coarse oscillator 2 pitch in a 16 16 semitones range oscl osc2 Fine oscillator 1 2 pitch in a 4 4 semitones range Also affects
14. g the result is shifted nal is required Important XOR modulation might make the Shruti 1 sounds like it s reading the Track 1 of a CD CD ROM or a text file mistakenly renamed sample wav Use moderately 2 2 15 Oscillator 2 sha prm rng tun saw 0 0 0 sha shape Oscillator 2 waveform shape The choice here is restricted to the classics blit saw pulse triangle prm parameter Oscillator 2 parameter rng range Oscillator 2 pitch transposition from 24 semitones to 24 semitones tun detune Fine detuning of Oscillator 2 2 2 16 Mixer mix sub noi sha 32 0 QO tri mix osc bal Oscillator 1 2 balance Might do something different than balance when an operator different from 1 2 is selected see the Oscillator 1 section sub sub osc Sub oscillator level noi noise Noise level sha shape Sub oscillator shape triangle or square Important Quirks ahoy 1 The noise is a bit colored in the low end pink instead of white and is here to make harmonic sounds sound dirtier If you rather want harsh bright white noise to create snares or hi hats you d rather use the noise from oscillator 1 2 The sub oscillator is not that razor sharp compared to the main oscillators This doesn t matter for the triangle wave but if you really want a low fat square underneath your main saw or square you d rather use the pwm waveform on oscillator 1 set to 12 semitones and your main oscilla
15. he modulation amount of patch cord 10 is adjusted by the modwheel Huh Let s say you set patch cord 10 to go from LFO 1 to the oscillators fine pitch with an amount of 16 mod src dst amt 10 1f1 16 This modulation will be triggered with an amount proportional to the modwheel position by default it won t be active until you start moving the modulation wheel and to get it at full strength you ll have to push the modulation wheel to the max 2 2 21 Arpeggiator bpm oct pat swg 120 2 i 28 e bpm Arpeggiator step sequencer Ifos clock tempo in BPM extern will sync to the clock ticks received from the MIDI input e oct Octave range of the arpeggiator When set to 0 the arpeggiator is off e pat Pattern The patterns are numbered from 1 to 15 and are available in 4 flavors up arrow pointing up down arrow pointing down up down wave and random question mark e swg Swing ratio of the internal clock The arpeggiator patterns are the following 00000000 O00 OOO O00 000 O O 00000 O 0000 PUNE gt O 0 00 00 0 00 0 12 0000 00 0000 OO Oo oO Oo oO o O 00 0 o O O 0 9090 oono 00 0 0 0 0 10 00 00 0000 oo oo 11 00000 00 oo ooo 12 0 o o 0o00 13 o oo o 0 0 00 14 o 000000 00 15 o o o o0 2 2 22 Step sequencer This page works a bit differently from the others It shows the value of the 16 steps of the step sequencer step sequencer O000f fff cccc4444 And has a blinking curs
16. lter cutoff 0 random Filter cutoff 0 2 2 Synthesis parameters page by page 2 2 1 Oscillator 1 sha prm rng op saw 0 g 1 2 e sha shape Oscillator 1 waveform shape e prm parameter Oscillator 1 parameter see below e rng range Oscillator 1 pitch transposition from 12 semitones to 12 semitones e op operator Modulator operation see below The Oscillator 1 is the richest The following is a list of all the available waveforms with some applications and a description of what adjusting the parameter setting does 2 2 2 none Silence Sometimes you just want the Shruti 1 to shut up to process an external signal This oscillator does not output any sound 2 2 3 blit Impulse train This waveform is a high pass filtered square wave or the other way round the square wave is actually built by low pass filtering this thing The parameter controls the spacing between the pairs of up down pulses This oscillator is good for thin sounds casio harpsichord and for simulating sounds filtered by a high pass band pass filter 2 2 4 saw Sawtooth This waveform is perfect for basses and brass sounds The parameter controls the waveshapping when you increase its value it shifts up an increasingly large section of the waveform 2 2 5 square Square wave The parameter controls the pulse width This waveform is perfect for simulating a clarinet for basses hollow sounds or Depeche Mode like leads
17. n frequency ratios are rational numbers pythagorean Pythagorean scale 1 4 eb E and B are 1 4 tone lower 1 4e E is 1 4 tone lower 1 4 ea E and A are 1 4 tone lower kanaka rasika Scenes a Kanakangi to Rasikapriya The keyboard mappings used are the same as those given on the wikipedia pages 3 Patch memory 3 1 Saving Now that you ve read all this and have created the killer patch you probably want to save it The Shruti 1 has a small memory of 16 patches The patches are saved in EEPROM so they will persist even when the Shruti 1 is powered down First thing to know about patch memory some settings are not saved From the pages we ve seen so far here are the settings not saved with your patch e Sequencer arpeggiator tempo swing pattern toctaves e Keyboard settings portamento transposition scale e MIDI channel e Modulation patch cords 11 12 13 and 14 The load save page is a bit different Jump to it by pressing the 5th group button patch bank From left to right are displayed 1 The memory slot number 2 The patch name 8 letters 3 The current action means do nothing The knobs have the following functions e knob 1 Selects a memory slot e knob 2 Moves the cursor e knob 3 inc dec Changes the letter at the current position of the cursor e knob 4 Selects an operation load on the left or save on the right in the middle position this cancels the current operation To
18. ometimes you might want to do weirder stuff for example ring modulation e The sub oscillator which is synchronized in pitch with the oscillator 1 but 1 octave lower also generates a basic waveform e The output of the modulator the sub oscillator and some additional noise are mixed together You can adjust the balance of each ingredient e The result is converted into an analog signal and mixed electrically with an external signal coming from the Audio in jack e The result is then sent to an analog VCF and VCA to produce the final audio signal Each of these modules has parameters represented by the blue arrows which can be controlled by any of the modulation sources listed below Some connections are hardwired or rather softwired in the firmware e The oscillators pitch always tracks the note e Lfo 2 and Envelope 1 are always connected to the filter but you can adjust the modulation amount and by default it is set to 0 Additionally the Shruti 1 has patchcords already in place for the following routing Source Destination Amount Lfo 1 Oscillator 1 coarse pitch 0 Lfo 1 Oscillator 2 coarse pitch 0 Lfo 2 Oscillator 1 PWM 0 Lfo 2 Oscillator 2 PWM 0 Lfo 2 Oscillators balance 0 Note Filter cutoff tracks Envelope 2 VCA gain 100 Velocity VCA gain 25 Bender Oscillator 1 2 fine pitch 2 semitones LFO Oscillator 1 2 fine pitch vibrato 2 semitones CV1 Oscillator 1 PWM 0 CV2 Oscillator 2 PWM 0 CV3 Fi
19. or Use the second knob to move the cursor remember the days gaming consoles controllers were pots the third knob or the inc dec buttons to adjust the value associated with each step The values are displayed in hexadecimal a 10 b 11 c 12 d 13 e 14 f 15 The fourth knob is used to adjust the cycle length Note that the cycle length setting is also applied to the arpeggiator When the cycle length is shorter the other steps are left blank step sequencer 02468ace80 When the step sequencer or arpeggiator are playing the 12th LED in the row blinks every 4th step Step 0 bright steps 4 8 12 dim You ll notice that even after releasing a key the LED continues blinking the arpeggiator and the sequencer continue counting steps so that the sequence pattern won t be interrupted if you start playing again After 4 beats without any new key press they stop and the next time you press a key they will restart playing the pattern from step 0 This delay makes it easier to play complex chords sequences with the arpeggiator on 2 2 23 Keyboard To end this long section a no quirks page oct rag prt chn O equ O 1 e oct Transpose every note by 2 1 0 1 or 2 octaves e rag Scale keyboard mapping e prt Portamento time e chn Midi channel the Shruti 1 is tuned to Set to 0 to receive from every channel 13 The different scales keyboard mappings are Name Description equal Equal temperament just Just intonatio
20. ss filter in which is sent white noise From 0 to 63 you progressively add high frequency content From 63 to 127 you progressively remove low frequency content Perfect as a raw material for percussions or sound effects 2 2 12 vowel Low tech formant synthesis WMA Mata add A WILP AAM ite eae yy A WNA By changing the parameter you ll sweep between different vocal like sounds 14 vowels and 2 conso nants Now Spell Daftpunk 2 2 13 table 32 waves wavetable A wavetable with organ digital piano single cycle waveforms The parameter allows you to scan and interpolate through the different waveforms in the table This oscillator is a good start for organs digital piano imitations drones 2 2 14 sweep blit saw square triangle scan This is a meta oscillator Depending on the value of its parameter it will behave like a blit a saw a square or triangle oscillator Perfect for evolutive wave sequences or SID like madness Important Quirks ahoy Now I have to confess three quirky things about the oscillators am very ashamed of 1 When you use the fm oscillator the range parameter doesn t affect the carrier that is to say the pitch of the note you re hearing it is affecting the modulator in a non linear way So when you use fm and adjust the range parameter it won t detune oscillator 1 it will just go through different categories of FM timbres 2 The vowel oscillator largely based on Peter Knight
21. the filter group button 2nd one and release 3 Turn the knob to which you want to assign the parameter you ve just edited 4 Repeat At step 2 the screen should display this touch a knob to assign parameter Then to jump to the performance page press the oscillator group button and release The 4 parameters you have assigned to the knobs are all there Wait there s more In the performance page the brightness of the first 11 LEDs of the row will reflect the value of each of the 11 modulation destinations filter cutoff VCA gain oscillators PWM When your modulation matrix is charged with LFOs the step sequencer or the arpeggiator gate it makes for really nice christmas decorations 4 1 3 Firmware update by MIDI Good news you don t need to open the Shruti 1 to update its firmware Hold the patch bank button when powering on the Shruti 1 and you ll enter in a special firmware update mode The LEDs 9 _ i m waiting for data_ and 11 _ from the MIDI port_ will be lit and the Shruti 1 will wait for some special SysEx commands contained in the firmware update MIDI file At this moment you can play from your favorite sequencer the MIDI file containing the firmware update This takes about a minute during which nothing should interrupt the operation be it a disconnected cable or a power failure The first 8 LEDs monitor the transfer like a progress bar The 9th LED blinks at each chunk received the 10th LED should be off
22. the sub oscillator s pitch mix Oscillator 1 2 balance or whatever the modulator does with the balance parameter noise Noise volume subosc Sub oscillator volume reso Filter resonance Wait what does it mean for a modulation source to be centered Let s take an example We have a triangle LFO mapped to the filter cutoff with a modulation amount of 30 If the cutoff is set to 80 the actual value of the cutoff will oscillate between 50 80 30 and 110 80 30 On the other hand if we have an envelope mapped to the cutoff with a modulation amount of 20 the cutoff will go from 80 to 120 80 2 20 then down to 80 after the release This is something to remember if you want to do PWM for example If you set the PWM modulation amount to 40 you also have to set the oscillator pulse width value to 40 so it oscillates between 40 40 0 and 40 40 80 Otherwise it will spend half of the time stuck at 0 But this makes things nicer for vibrato tremolo wah wah grow 11 40 0 LFO Pulse width OSC 1 Parameter F bad 40 o LFO OSC 1 Parameter Pulse width v good Important Quirks ahoy 1 When you are in the modulation matrix page the page indicator LED will blink dim to visualize the value of the selected modulation source 2 The settings for patch cords 11 14 are not saved to memory when you save a sound Use them for performances experimentation etc 3 You re going to hate me for this one T
23. tor on oscillator 2 2 2 17 Filter marae cut res env lfo 66 0O 16 37 e cut cutoff Filter cutoff frequency e res resonance Filter resonance e env envl gt vcf Modulation amount from envelope 1 to VCF If you want to set a negative modulation amount no problem you can patch env1 to the VCF in the modulations section and ignore this parameter e Ifo Ifo2 gt vcf Modulation amount from LFO 2 to VCF Again if you want to set a negative modulation amount you can patch the LFO 2 to the VCF in the modulations section and ignore this parameter 2 2 18 Envelope 1 2 atk dec sus rel O 44 20 60 e atk attack Envelope attack time e dec decay Envelope decay time e sus sustain Envelope sustain level e rel release Envelope release time 2 2 19 LFOs wri rti v2 rt2 tri 80 tri x16 e wvl Ifol wave LFO1 waveform triangle square sample amp hold ramp sawtooth e rtl Ifol rate LFO1 rate e wv2 Ifo2 wave LFO2 waveform triangle square sample amp hold ramp sawtooth e rt2 Ifo2 rate LFO2 rate Wait what s this x something when set the LFO rate to a low value This is the Clock gt LFO synchronization x16 simply means the LFO will do one full cycle over a duration of 16 sequencer steps 4 beats For example if you set the LFO to a ramp with a rate of x4 and map it to the cutoff the cutoff will raise over the duration of a beat and return to a low value at the beginning of each
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