Operation Manual
Mopho x4 Operation Manual Version 1.0 July 2012 Dave Smith Instruments nd 1527 Stockton Street, 2 Floor San Francisco, CA 94133 USA ©2012 Dave Smith Instruments www.DaveSmithInstruments.
Tested To Comply With FCC Standards FOR OFFICE USE This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation. This Class B digital apparatus meets all requirements of the Canadian InterferenceCausing Equipment Regulations.
Contents Quick Start ................................................................................................ 1 Getting Connected .................................................................................... 3 Basic Operation ........................................................................................ 4 Global Parameters .................................................................................... 8 Oscillators ...............................................
Quick Start Thanks for purchasing your Mopho x4 synthesizer! Listen to the sounds, twiddle some knobs, have some fun! Please Register! Please go to www.davesmithinstruments.com and register your synth. If you purchased directly from us, there is no need to register—we already have your contact information. Powering Up Plug in the power supply, connect (in stereo!) to your mixer/sound system, and start playing! Try applying keyboard pressure (aftertouch) and the mod wheel.
Summary You should be up and running now; for more operation information, read on. Or, just look up specific parameters for detailed notes. Pages 32 and 33 contain a handy reference for mod sources and destinations. At some point you should read through the manual to discover all the little features that you might not notice at first. Download the free LE version of Soundtower’s Mopho x4 editor from www.soundtower.com/mophox4.
Getting Connected Mopho x4 has several inputs and outputs on its back panel. Power Input — Connect the power supply included with your Mopho x4. The power supply comes with different AC adaptors that enable it to work almost anywhere in the world. If for whatever reason you need to use a different supply, it must match the specifications printed on the back panel. USB—Mopho x4 transmits and receives MIDI data via this standard, Type B, USB receptacle. See Using USB on page 35 for more information.
Basic Operation If you’re familiar with analog, subtractive synthesis there shouldn’t be anything that looks terribly foreign or strange about Mopho x4’s front panel. All of the basic building blocks are there. But one of the challenges of making a compact synth is giving the user access to all the parameters within a limited amount of panel area.
Compare—When editing a Program, press COMPARE to hear the saved version. Turn COMPARE off to return to the edited version. COMPARE can also be used to audition write destinations when moving a program. Write—Press WRITE to save the program and write any edits to memory. You can write the program to the same location or choose a different program number using PARAM 1; PARAM 2 chooses the bank. Press INC/YES to confirm the write and DEC/NO (or WRITE again) to abort.
TAP TEMPO can also be used to change the tempo while a sequence is playing. If SHIFT is on while a sequence is playing, tap the button 5 times and the sequence speed will change to the tapped tempo on the fifth hit. You can continue to tap the button, slowing down or speeding up, and the sequence tempo will adjust accordingly. The sequence will average and smooth out any small timing differences. Modes of Operation Mopho x4 has three operating modes: program, edit, and global.
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Global Parameters Mopho x4’s Global parameters affect all programs globally. Examples include MIDI channel and fine tune. To edit the Global parameters, hold down the PROGRAM switch until Global Parameter is displayed. The PARAM 1 knob changes the global parameter and PARAM 2 knob and increment and decrement buttons change the value. Transpose: -12…+12—Master Transpose control, 0 is centered. Steps in semitones. Fine Tune: -50…+50—Master Fine Tune control; 0 centered.
MIDI SysEx: Off, On—When On, the synth will respond to received MIDI SysEx messages, and will transmit them, when prompted, to the MIDI Out. See Sysex Messages on page 56 for details. MIDI Out Select: Out, Thru—MIDI Out can be switched to MIDI Thru to daisychain multiple MIDI devices. Poly Chain: Off, Out 1, Out 4, Out 5, Out 8, Out 12, Out 16—Used to expand the polyphony via the Poly Chain output and one or more DSI synths—Mopho, Tetra, or Prophet. See Using Poly Chain on page 37 for more information.
Jump mode uses an absolute value based upon the position of the pot when edited: turn a pot and the value jumps immediately from the stored value to the edited value. Sustain: Norm +, Norm -, Arp +, Arp - —A momentary footswitch connected to Mopho x4’s Sustain input can be used either as a sustain pedal or to latch the arpeggiator. Mopho x4 can be configured for use with either normally open (+) or normally closed (-) footswitches.
BalanceTweak1 - BalanceTweak4: -14…14—Adjusts the left/right output balance of each voice by approximately +/- 4 dB. MIDI SysEx Dump: see table—Allows dumping of Programs in SysEx format via MIDI. Also enables the translation of Mopho x4 programs into formats readable by other DSI synths. The Mopho Keyboard and Tetra voice architectures and voice program parameters are basically the same as the Mopho x4’s.
Oscillators Mopho x4 has two digitally controlled analog oscillators, or DCOs, per voice. “Digitally controlled” does not mean the oscillators themselves are digital, just that the oscillators’ frequencies are under digital—rather than voltage—control. The advantage to that is that the tuning is exceptionally stable over a ten-octave range without having to compensate for variables like temperature. The audio signal path is still completely analog.
wave, higher values widen it. At the extreme values, the pulse goes completely flat, which allows for some interesting possibilities with pulse width modulation. Glide: 0...127—Sets the oscillator glide (portamento) rate. Glide can be set independently for each oscillator. Low values are faster. See also “Glide Mode” in Other Oscillator Parameters. Sub Octave: 0...127—Controls the level of a square wave pitched one octave below oscillator 1 or two octaves below oscillator 2.
Glide Mode: FixRate, FixRate A, FixTime, FixTime A—Determines how the oscillators respond when GLIDE is on. FixRate: The time to transition between notes varies with the interval between the notes; the greater the interval, the longer the transition time. The glide rate is fixed. FixRate A: The same as FixRate, but glide is only applied when playing legato. That is, glide only occurs when a note is held until the next note is played. This effectively allows glide to be turned on and off from the keyboard.
Mixer The Mixer section balances the levels of the outputs of the Oscillators section and noise generator, and the Audio In/feedback loop before routing the summed signals to the low-pass filter. Mix: 0...127—Mixes the outputs of oscillators 1 and 2 in varying amounts. A setting of 0 is equivalent to 100% oscillator 1 and 0% oscillator 2. A setting of 127 is just the opposite. A setting of 64 is a 50/50 mix of both oscillators. Feedback Amount: 0...
Filter Mopho x4 features a selectable 2- or 4-pole, low-pass filter per voice. 4-Pole—Selects the filter configuration. When lighted, the filter is in 4-pole mode. A 4-pole, low-pass filter rolls off frequencies above the cutoff frequency at a slope of 24dB/octave. When the light is off, the filter is in 2-pole mode and has a slope of 12dB/octave and a more gradual rolloff of the higher frequencies. Frequency: 0...164—Sets the base filter cutoff frequency over a range of more than 13 octaves.
Envelopes Mopho x4 has three 5-stage (Delay + ADSR) envelope generators per voice. Two are dedicated—one to the filter and the other to the amplifier—and the third is assignable to any modulation destination. Envelope Select—Selects the envelope to edit. When all three are lighted, the other envelope parameters control all three envelopes simultaneously. Amount: -127...127—Sets the amount of modulation from the envelope to the destination: filter, amplifier, or the selected destination for envelope 3.
LFO Mopho x4 has four low frequency oscillators (LFOs) per voice. The LFOs can be free-running, synced to keystrokes, or synced to the sequencer and MIDI clock. To edit the LFO parameters, choose LFO in the Modulation section. LFO Select: 1, 2, 3, 4—Chooses the LFO to edit. Tip: The four numbered lights above the Frequency knob pulse at the frequency of the corresponding LFO. This can be a great aid in knowing which LFO to select for editing.
Tip: The sequencer must be on for the LFO to sync, even if all four sequence destinations are set to Off. The sequencer will still gate the envelopes, so if you don’t want to hear the discrete sequencer steps, adjust the envelopes accordingly. (In other words, turn Amp and/or Filter Sustain and Release up as needed until you don’t hear the steps.) Editing FREQUENCY shows the values in the following table. Display 32 Steps 16 Steps 8 Steps 6 Steps 4 Steps 3 Steps 2 Steps 1.
Sequencer For many musicians, the term sequencer has become synonymous with MIDI sequencer; that is, a computer-based application or dedicated hardware device for recording and playing back notes and performance gestures via MIDI. But sequencers were around long before MIDI. Mopho x4’s sequencer is much more like the original analog sequencers typically associated with modular synthesizer systems. The sequencer comprises four 16-step sequences that play in parallel.
does not respond to MIDI start/stop/continue messages, but it can still sync to an external clock. Simply turn on the sequencer and then play and hold a note to start. Or use the PUSH IT button’s toggle feature to latch a note on with one push and release it with another; in this case, the PUSH IT button is essentially a Start/Stop control. Reset and Rest Sequences have a maximum of 16 steps, but they can have fewer—from 1 to 15—using Reset. (Sequences of 16 steps reset automatically.
Sequence one has an additional value, Rest, that appears in the list after Reset. Rest prevents the envelopes from being gated by the corresponding step, so a rest in sequence one affects all four sequences. If the sequences are the same length, rests will occur in the same place in all four sequences as they loop.
To avoid having to hold a key down, set the Push It Mode (Misc. Parameters) to Toggle. Then use PUSH IT to start and stop the sequencer. You may also want to change the Push It Note, the BPM, and the CLOCK DIVIDE. 5. Choose a destination for the sequence. 6. Use the STEP and VALUE controls to enter the desired values. As the sequence loops, you will hear your edits. 7. Choose another sequence and follow the same basic steps until you’re happy with the results. 8.
Note: Depending upon the BPM and CLOCK DIVIDE settings, the slew rate can actually exceed the time the envelopes are gated on, causing a step in the affected sequence to not reach its set value. For example, if Slew is applied to oscillator frequency, high Slew values may cause a step to sound flat or sharp. If that’s not what you want, simply reduce the Slew value. Sequencer Trigger Modes The Sequencer Trigger mode determines how the sequencer reacts to triggers and what constitutes a trigger.
Modulators Modulators lets you configure the modulation routing and amount for Mopho x4’s four general-purpose modulation slots. Since each Mopho x4 modulation source has a single destination, the four general purpose modulators provide a way to send a mod source (such as a sequence or LFO) to additional destinations, with a different amount. There are also additional mod sources available here, such as Noise, allowing a wide variety of possibilities.
Miscellaneous Modulators There are certain standard controllers that Mopho x4 consigns to dedicated modulators, things like mod wheel, pressure (AKA aftertouch), and velocity. The most obvious benefits to doing this is it provides a shortcut to setting up commonly used controllers and it frees up the four general-purpose mod slots for other, more Mopho x4-specific applications. Select MISC MOD in the Modulation section to get started.
Clock The Clock section contains the controls for the internal clock tempo and the note value for the arpeggiator and sequencer (and LFO, when CLOCK SYNC is on). There are also switches to turn the arpeggiator and sequencer on and off. Arpeggiator—Turns Mopho x4’s arpeggiator on and off. The tempo and note value are determined by the BPM and CLOCK DIVIDE settings. ARPEGGIATOR MODE is set in Miscellaneous Parameters.
When ArpLatch is set to Normal and latch is on, pressing one or more keys and then removing your hands from the keyboard will latch the played notes. Playing additional notes while latched adds them to the notes already playing. When ArpLatch is set to ReLatch, pressing one or more keys and then removing your hands from the keyboard will latch the played notes. Subsequent notes or chords played will cause the previously latched notes to stop playing and be replaced by the newly played note(s).
Note: BPM is based on quarter notes, so clock divisions are relative to a quarter-note beat. For example, when CLOCK DIVIDE is set to Eighth, two notes or steps will play per beat.
Miscellaneous Parameters Miscellaneous Parameters groups together programmable parameters that do not conveniently fall into any obvious section or, if they do, are parameters that are less frequently used. They are important, but generally not required for performance. Voice Volume: 0…127—Sets the volume of the current program to match volumes between programs. Note: There is enough gain in the synth voice that with some settings, some mild clipping distortion may be heard.
destination will individually move each voice from its static position as set by PAN SPREAD. Push It Mode: Normal, Toggle—When set to Normal, PUSH IT responds like a key: press it and a note plays, release it and the note ends. But when set to Toggle, PUSH IT turns the note on with one press and off with a second press. This is handy for making a note drone or for latching a gated sequence on. Push It Note: C0…C10—Sets the note that plays when PUSH IT is pressed.
Modulation Sources Display Off Sequence1 Sequence2 Sequence3 Sequence4 LFO 1 LFO 2 LFO 3 LFO 4 Filt Env1 VCA Env 2 Envelope3 PitchBend Mod Wheel Pressure MidBreath Midi Foot Midi Exp Velocity KeyNumber Noise 32 Source No source selected Sequence 1 Sequence 2 Sequence 3 Sequence 4 LFO 1 LFO 2 LFO 3 LFO 4 Filter Envelope Amp (VCA) Envelope Envelope 3 Pitch Bend Mod Wheel Pressure (Aftertouch) MIDI - Breath Controller MIDI - Foot Controller MIDI - Expression Keyboard Note Velocity Keyboard Note Number Nois
Modulation Destinations Display Off Osc 1 Freq Osc 2 Freq OscAllFreq Osc Mix NoiseLevel Osc1 PulsW Osc2 PulsW Osc All PW Low Pass Resonance Audio Mod VCA Level Output Pan LFO 1 Freq LFO 2 Freq LFO 3 Freq LFO 4 Freq LFOAllFreq LFO 1 Amt LFO 2 Amt LFO 3 Amt LFO 4 Amt LFOAll Amt Env 1 Amt Env 2 Amt Env 3 Amt EnvAll Amt Env1Attack Env2Attack Env3Attack EnvAll Att Env1 Decay Env2 Decay Env3 Decay EnvAll Dec Env1Releas Env2Releas Env3Releas EnvAll Rel Mod 1 Amt Mod 2 Amt Destination No destination selected Osc
Mod 3 Amt Mod 4 Amt Fback Amt Sub Osc 1 Sub Osc 2 Fback Gain Slew Modulator 3 Amount Modulator 4 Amount Feedback Amount Sub Oscillator 1 Level Sub Oscillator 2 Level Feedback Gain Sequencer Slew* *Appears as a destination in sequences 2 and 4 only.
Using USB Mopho x4’s USB 2.0 port enables bidirectional MIDI communication with a computer. A MIDI interface and MIDI cables are not necessary, just a USB cable. Mopho x4 is a Class Compliant USB device. That means it does not require any additional drivers to be installed to communicate with a Mac or Windows computer. Mopho x4 transmits and receives MIDI data via USB, but does not transmit audio.
Windows Vista and Windows 7 behave the same as XP, but the device name is DSI Mopho x4 rather than USB Audio Device. In Windows, if you unplug the USB cable and plug it back in while a program has the Mopho x4 port open, you may have to resync. That usually means going to the USB Audio Device (or DSI Mopho x4) Properties, as in the procedure above, and clicking OK.
Using Poly Chain Mopho x4’s Poly Chain output enables it to be connected to other DSI synths for up to 20-voice polyphony. Products that can be chained include the Tetra, Prophet '08 (module and keyboard), and desktop Mopho. It will not chain with the Evolvers and Poly Evolvers due to the different voice architecture.
Note: If syncing to an external MIDI clock, set MIDI Clock (Global menu) on the master and any intermediate units to MIDI In/Out. Set the last instrument in the chain to MIDI In. When Poly Chain is set to Off, the Poly Chain MIDI out jack simply duplicates the MIDI out jack.
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Support Troubleshooting Here are a few suggestions for resolving problems that may occur. The sequencer has stopped running. Make sure Clock in the Global menu is set to Internal. Some of the programs sound different. Check the Mod Wheel position. The Mod Wheel can do a lot more than just add vibrato. Also, some of the programs use the sequencer to shape the sound so make sure Clock in the Global menu is set to Internal. There is a ground hum in the audio output.
Warranty Repair Dave Smith Instruments warrants that Mopho x4 will be free from defects in materials and/or workmanship for 1 year from the date of purchase. Please register your product online at www.davesmithinstruments.com to establish the date of purchase. (This is not a requirement for warranty service, but it will help expedite the process.) Please contact support@davesmithinstruments.com to determine the best course of action for getting your Mopho x4 repaired.
MIDI Implementation Mopho x4 receives MIDI data according to the mode controls under GLOBAL. In addition, there is interaction between some of the Program parameters that determine the overall response of Mopho x4 to MIDI data. Following are the Global parameters that affect response to MIDI: MIDI Channel: ALL, 1…16 — Selects the MIDI channel to send and receive data, 1 to 16. All receives on any channel.
MIDI Messages System Real-time Messages Status 1111 1000 Description MIDI Timing Clock Received Channel Messages Status 1000 nnnn 1001 nnnn 1010 nnnn 1011 nnnn Second 0kkkkkkk 0kkkkkkk 0kkkkkkk 0vvvvvvv 1100 nnnn 0ppppppp 1101 nnnn 1110 nnnn 0vvvvvvv 0vvvvvvv Notes: 0kkkkkkk nnnn Third 0vvvvvvv 0vvvvvvv 0vvvvvvv 0vvvvvvv 0vvvvvvv Description Note Off. Velocity is ignored Note On.
Transmitted Channel Messages Status 1000 nnnn 1001 nnnn 1011 nnnn Second 0kkkkkkk 0kkkkkkk 0vvvvvvv 1100 nnnn 0ppppppp 1101 nnnn 1110 nnnn 0vvvvvvv 0vvvvvvv Notes: 0kkkkkkk nnnn 0vvvvvvv Third 0000000 0vvvvvvv 0vvvvvvv 0vvvvvvv Description Note Off. Note On.
Additional Continuous Controllers (CCs) Transmitted/Received The following table details how CCs are mapped onto Mopho x4’s controls. They are transmitted when MIDI Parameter Send is set to CC in Global, and recognized when received when MIDI Parameter Receive is set to either CC or All in Global.
NRPN Messages The Non-Registered Parameter Number (NRPN) MIDI messages are used to transmit and receive both global and program parameters. They are transmitted when MIDI Parameter Send is set to NRPN in Global, and received when MIDI Parameter Receive is set to either NRPN or All in Global. The messages are handled in standard MIDI format using the NRPN CC commands in running status byte format.
Received NRPN Messages Status Second Third Description 1011 nnnn 0110 0011 0vvvvvvv NRPN parameter number MSB CC 1011 nnnn 0110 0010 0vvvvvvv NRPN parameter number LSB CC 1011 nnnn 0000 0110 0vvvvvvv NRPN parameter value MSB CC 1011 nnnn 0010 0110 0vvvvvvv NRPN parameter value LSB CC 1011 nnnn 0110 0000 0xxxxxxx NRPN parameter value Increment 1011 nnnn 0110 0001 0xxxxxxx NRPN parameter value Decrement 1011 nnnn 0010 0101 0111111 RPN parameter number MSB CC - Reset NRPN parame
Param NRPN 8 406 0-1 Range MIDI Out Select*: 0 MIDI Out 1 MIDI Thru 9 387 0-6 Poly Chain*: 0 Off 1 Out 1 2 Out 4 3 Out 5 4 Out 8 5 Out 12 6 Out 16 10 389 0–1 Local Control* Off/On 11 400 0-1 Audio Outputs: 0 Stereo 1 Mono 12 404 0-2 Pot Mode: 0 Relative 1 PassThru 2 Jump 13 397 0-3 Damper Polarity: 0 Sustain, normally open 1 Sustain, normally closed 2 Arpeggiator latch, normally open 3 Arpeggiator latch, normally closed 14 396 0-5 Pedal Destination: 0 Foot Control 1 Breath Cont
Program Parameter Data The following table lists Mopho x4’s voice parameters. The parameter number in the program and edit buffer dumps are different than the NRPN numbers as seen; this was to maintain NRPN compatibility with the Prophet ’08 as much as possible.
50 22 23 24 25 26 27 28 29 30 31 17 18 19 20 21 22 23 24 25 26 0 - 127 0 - 127 0-1 0 - 254 0 - 127 0 - 127 0 - 127 0 - 127 0 - 127 0 - 127 Filter Keyboard Amount Filter Audio Modulation Filter Poles 0: 2-pole; 1: 4-pole Filter Envelope Amount; -127 to +127 Filter Envelope Velocity Amount Filter Envelope Delay Filter Envelope Attack Filter Envelope Decay Filter Envelope Sustain Filter Envelope Release 33 34 35 36 37 38 39 40 41 30 31 32 33 34 35 36 28 29 0 - 127 0 - 127 0 - 127 0 - 127 0 - 127 0 - 127
49 50 44 45 0 - 127 0 - 47 51 52 53 54 55 46 47 48 49 50 0-1 0 - 166 0-4 0 - 127 0 - 47 56 57 58 59 60 51 52 53 54 55 0-1 0 - 166 0-4 0 - 127 0 - 47 61 56 0-1 62 57 0 - 47 63 64 65 66 67 68 69 70 58 59 60 61 62 63 64 98 0 - 254 0 - 127 0 - 127 0 - 127 0 - 127 0 - 127 0 - 127 0-1 71 72 73 65 66 67 0 - 22 0 - 254 0 - 47 74 75 76 68 69 70 0 - 22 0 - 254 0 - 47 77 78 79 71 72 73 0 - 22 0 - 254 0 - 47 80 81 82 74 75 76 0 - 22 0 - 254 0 - 47 83 84 81 82 0 - 254 0 - 47 LFO 2 Amount
52 85 86 83 84 0 - 254 0 - 47 86 88 85 86 0 - 254 0 - 47 89 90 87 88 0 - 254 0 - 47 91 92 89 90 0 - 254 0 - 47 93 95 0-4 94 96 0-5 95 96 97 99 111 112 0-1 0 - 120 0 - 127 98 113 0-1 101 102 91 92 30 - 250 0 - 12 Pressure Amount; -127 to +127 Pressure Destination; See Modulation Destination list below Breath Amount; -127 to +127 Breath Destination; See Modulation Destination list below Velocity Amount; -127 to +127 Velocity Destination; See Modulation Destination list below Foot C
103 97 0 - 14 104 105 100 94 0-1 0-4 106 107 101 77 0-1 0 - 48 108 78 0 - 48 109 79 0 - 48 110 80 0 - 48 120 - 135 120 - 135 0 - 127 136 - 151 136 - 151 0 - 126 152 - 167 152 - 167 0 - 126 168 - 183 168 - 183 0 - 126 184 - 199 184 - 199 32 - 127 Arpeggiator Mode: 0 Up 1 Down 2 Up/Down 3 Assign 4 Random 5 Up 2 Octaves 6 Down 2 Octaves 7 Up/Down 2 Octaves 8 Assign 2 Octaves 9 Random 2 Octaves 10 Up 3 Octaves 11 Down 3 Octaves 12 Up/Down 3 Octaves 13 Assign 3 Octaves 14 Random
The following tables list the values used with the program parameters to specify modulation destinations and sources.
Mod 1 Amt Mod 2 Amt Mod 3 Amt Mod 4 Amt Feedback Amt Sub Osc 1 Level Sub Osc 2 Level Feedback Gain Slew* 40 41 42 43 44 45 46 47 48 *Appears as a destination in sequences 2 and 4 only.
Sysex Messages Universal System Exclusive Message (Device Inquiry) Status 1111 0000 0111 1110 0vvv vvvv 0000 0110 0000 0001 1111 0111 Description System Exclusive (SysEx) Non-realtime message If MIDI channel is set to 1 - 16, 0vvvvvvv must match (unless MIDI Channel = ALL); always responds if 0vvvvvvv = 0111 1111.
Request Program Edit Buffer Dump Status Description 1111 0000 System Exclusive (SysEx) 0000 0001 DSI ID 0010 1001 Mopho x4 ID 0000 0110 Request Program Edit Buffer Transmit 1111 0111 End of Exclusive (EOX) Mopho x4 will respond by sending out the current Program edit buffer in the format described below in Program Edit Buffer Data Dump.
Program Edit Buffer Data Dump Status Description 1111 0000 System Exclusive (SysEx) 0000 0001 DSI ID 0010 1001 Mopho x4 ID 0000 0011 Edit Buffer Data 0vvv vvvv 256 bytes expanded to 293 MIDI bytes in “packed MS bit” format (see page 58.) 1111 0111 End of Exclusive (EOX) Global Parameters Data Dump Status Description 1111 0000 System Exclusive (SysEx) 0000 0001 DSI ID 0010 1001 Mopho x4 ID 0000 1111 Main Parameter Data 0vvv vvvv 50 nibbles (LS then MS) for 25 Global parameters.
“Hidden” Functions The term “hidden function” has an air of mystery and secrecy about it, but it simply refers to commands that are rarely used and don’t warrant dedicated buttons or menu items. Calibration Routine—Mopho x4’s calibration routine should not be confused with the autotune function on vintage polysynths with VCOs. Mopho x4’s DCOs don’t go out of tune (unless they’re programmed to). The calibration routine sets the waveshape symmetry and calibrates the low-pass filters.
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Dave Smith Instruments nd 1527 Stockton Street, 2 Floor San Francisco, CA 94133 USA www.DaveSmithInstruments.
