Tuesday, March 10, 2009

Matrix synth comments.

I added some comments to Matrix Synth:

"some sources describe this synth as a duphonic/ multiphonic ,others describe it as a 4 voice polyphonic. I have a feeling it is a 4 voice polyphonic but the 4 voices are split between cello (two tones) and violin (2 tones) . It then uses divide down chips enabling all keys to be played at once)"

Nearly. It has two master oscillators which are both dived down to give you the full set of notes, twice.

You need two waveforms to get a stringy effect so the same note outputs of the dividers are mixed.

When you press a key you're switching in a mix of two divided down oscillators.

The detune affects both oscillators but not equally hence you can detune one against the other and get to the good old thick sound but more importantly set the PWM type character you need for strings.

The outputs of these mixed waveforms are sent to either the Violin, Viola, or Cello mixers. In some cases the outputs can be sent to either one or the other mixer as set by the split selector switch.

The cello, viola or violin character is set by filters after each mixer. Violin 1 & 2 just are different (1st order) filters fed from the mixer, so when you switch them in you're just mixing and matching different filtered outputs of the same thing. the same goes for Cello 1 & 2.

So far it's just a paraphonic organ but with two tones per key. However the SS30 rules over other string synths because it has an AR envelope generator per key. When you set a long attack each time you press a key it starts a new attack just for that key. same with Release.

There's no VCF per key but that's what we have Polymoogs and, err, GX1's for.

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