Seb's Synth-DIY Pages

Digi-Mod - Functionality ideas

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These are my initial ideas for the Digi-Mod functionality..

Mode 1: SuperVCO

This is a multi-oscillator, designed to create thick, rich tones made up from multiple basic waveforms detuned from each other.  CVs control the number of oscillators, detune amount, stereo spread and oscillator shape.  There is also a hard sync input, and 'Maximiser' functionality (see Mode 4).  The function of the oscillator shape control depends on the waveform selected:

Mode 2: Sampler

This is a voltage controlled sampler with all parameters controllable in realtime.  There are 2 memory slots in which samples can be stored with the power off.  It has the feature that the playback end point can be moved before the start point and playback will reverse.

Mode 3: Delay

This is similar to the 4xD delay and supports the same resampling mode (see here) for BBD-style dub effects, and has a built in LFO for flanging.  In Mono mode the input to both channels is taken from input 1, thus doubling the available delay time.

Mode 4: Warper

This is a wave-warper than can also be used to process more complex sources.  It is similar in principle to a compressor/expander, but working instantly, at a waveform level (i.e. there is no attack or release time).  The first 50% of the control range (towards 'Minimise') are similar to an expander, with the other 50% of the control range (towards 'Maximise') being similar to a compressor/limiter.

General controls

Port(s) Control type Control name Panel components
J8:1+2 2-bit rotary Sample rate Rotary switch
J3:7+8 2-bit rotary Mode select Rotary switch
J7:3 CV Analog feedback 1 CV input
(normalised to CV pot)
J7:7 CV Analog feedback 1 CV input
(normalised to CV pot)

Mode specific controls

Port(s) Control
Panel components Mode 1:
Mode 2:
Mode 3:
Mode 4:
J4:1+2 CV Fine CV pot
CV input
(normalised to CV pot)
Pitch Pitch Delay time 1 Minimise->
Maximise 1
J4:3+4 CV Fine CV pot
CV input
(normalised to CV pot)
Loop start point Delay time 2 Minimise->
Maximise 2
J4:5+6 CV CV pot
CV input
(attenuated by pot)
Oscillator detune Playback start point LFO rate Gain 1
J4:7+8 CV CV pot
CV input
(attenuated by pot)
Oscillator shape Playback end point LFO amount Gain 2
J4:9 CV CV pot Oscillator count Attack Delay time range 1  
J4:10 CV CV pot Stereo spread Release Delay time range 2  
J3:1 Switch Switch Detune range Memory A/B Mono/Stereo  
J3:2 Gate Button
Gate input
  Start/stop recording Delay time gate 1  
J3:3+4 Gate Button (J3:3)*
Gate input (J3:4)*
Hard sync Start/stop playback Delay time gate 2  
J3:5+6 2-bit
Rotary switch Waveform:
Loop mode:
One shot
One shot ping-pong
Forwards looping
Ping-pong looping
LFO phase:


* J3:3 is software debounced, whereas J3:4 is not so it can be triggered by audio rate gate signals.

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