simple midi controlled dco with gate output for modular synth

Design Concepts
1

Hello,

I have been searching quite some time, reading about the various sound producing projects here. It is very exciting stuff!

I am looking for a little code for a project i have in mind, and maybe someone here knows if it exists already…

That would be great if you could point me to a link.

It is supposed to put out a squarewave and gate signal, work together with analog voltage controlled envelope, Filter, VCA.

The aim is to build a simple synth voice without the trouble of building a VCO and midi cv converter.

What i have in mind is:

A DCO based on a PIC that will output a square wave

Voltage controlled PWM

Voltage controlled pitch mod ? No idea if this is asking too much…

Tuned by MIDI

Square wave Output is always “on”, playing the pitch of the last midi note.

A gate signal is generated with any key pressed. That gate controls an envelope for the analog VCA.

Sounds similar to something you have seen?

Thanks!

2

Have you seen this already: http://www.midibox.org/dokuwiki/doku.php?id=coresound ?

3

yes i have and it looks very interesting.

But i assume that it will fade out the signal by itself when a key is released.

For use with an envelope generator and analog vca it is necessary to have the waveform present at all times. The envelope will than fade out the sound, timed by it´s release control.