Detailed Description of PLJ Modular 1.0

Whilst not entirely modular (in that you can't just add more bits), this is a six oscillator, six envelope synth is pretty flexible, I think.

Hopefully the user interface is self-explanatory. However, here's my explanation...

As an analogue modelling synth, terminology is in terms of control voltages (abbreviated to "CV").

There are five modulators, a tone (timbre) generator, a filter section and an ADSR-controlled amp.

The modulator inputs can be a fixed value (any of the five knobs) or from MIDI pitch, velocity or aftertouch. The MIDI values 0 to 127 are mapped to control voltage levels 0v to 10v. Of course, one input can go to more or more modulators.

Each modulator has two optional stages - the envelope and the oscillator.

The envelope sections can be used to shape the incoming CV. For example, a modulator with pitch as its input has a range of 0v to 10v. Setting A=0, D=0, S=1, R=0 means this range is scaled down to 0v to 1v, which is probably more useful. (A/D/R 0 is a pretty short time but note that the full CV is passed through briefly. In bypass mode, of course, the entire voltage passes, unaffected.)

The oscillator sections can be used to generate a periodically varying CV. The incoming CV either affects (adds to) the oscillator rate or depth voltages. (In "bypass" mode, the output will be flat.) These are not just "low frequency" oscillators - they are full range. Stick below a rate of about 6v for "traditional" low frequency controls. Take care with depth - some effects require subtlety, particularly adding noise.

The output from each modulator can be routed to (to add to) any one of the following:

* the audio wave form pitch (also fed from the MIDI pitch) to effect tremelo (or pitch modulation)
* the audio wave form pulse width (only any use on pulse waves, of course) to effect pulse width modulation
* the filter cutoff
* the filter resonance
* the overall volume (also fed from the MIDI velocity and aftertouch) to effe

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