[sdiy] Polyphonic MIDI to CV

Rutger Vlek rutgervlek at gmail.com
Fri Jul 9 19:49:28 CEST 2021

Interesting project! I have been playing with the same idea for a while.
It's quite a challenge to replace keyboards with buss bars typically used
in divide down architectures. The range probably does not need to cover
alle 128 midi notes, but at least the range of a stringer. A large array of
quad VCAs (2164) could do the trick, but is rather costly. Via mcu you
would be able to combine VCAs for multiple octaves on a single key
(something normally done with multiple buss bars).

An alternative architecture I wondered about is a Bottom Octave generator
and Saw wave multipliers to achieve the higher octaves. In theory it could
give you saw and square waves simultaneously for all notes, but I don't
know if it can be implemented in analog reliably. Has anyone ever tried it


Op vr 9 jul. 2021 13:18 schreef francesco mulassano via Synth-diy <
synth-diy at synth-diy.org>:

> Hi, I'm thinking of creating a string machine starting from a project from
> the 70s. Basically, a replica of an analog string machine with new
> components. The tricky part I think is the full polyphony with the MIDI to
> CV conversion. There will be no keyboard in the instrument but there will
> be midi input connection.
> Do you have any idea, project that does not use commercial modules that
> would be impossible to implement in the circuit?
> Thank you
> Francesco
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