[sdiy] poly?

[James Patchell]

Actually it is not all that hard, but it is involved.

Number one requirement:The use of a microprocessor for allocating notes to 
hardware.

Back in 1978 I built a poly (four voice).  You need, of course, a number of 
identical synth channels, and an interface between your keyboard and the 
synth hardware, which consists of the micro controller.  John Simonton 
(Paia), I would say, pioneered the DIY poly with the 8700 keyboard.

The software for doing the control is not complicated.  On a 6502 that I 
used, the firmware used up a whopping 256 bytes or so of code space, and 
used about 64 bytes or ram.  Although, I originally used a Polymorphic 8813 
(S100 based) computer to do the job originally.

Old issues of Polyphony, from the 1975-76 era should have a lot of articles 
on the subject.

At 05:11 AM 2/17/2004 -0800, Andalong Dudigual wrote:
>hello everyone, I feel a little dumb asking this, but
>I never really understood how to make a synth
>polyphonic. what are some different methods?
>
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         -Jim
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I'm a man
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