VCO

[Grant Richter]

> 
> > My current project is to replace the PLL/Counter circuit with a high
speed
> > DAC run off a sawtooth to generate the address bits. This is bound to
be
> > imperfect but then again it's music not space shots. This has the
advantage
> > of allowing different sweep types depending on the input waveform. This
> > also makes the wavetable board truely an add-on waveshaper.
> 
>    Do you mean running a sawtooth waveform through an ADC to generate 
> address bits?  I thought about trying this (just a passing thought in my 
> head really)  but I've wondered how good this would really work as 
> imperfections in the driving waveform (be it a saw, tri, etc) would make 
> for some interesting glitches in the resulting output.
>    But you're right, it'd make some interesting wave table sweep 
> possibilities.  Using a triangle wave would be fun as it'd ping-pong 
> through the wave table.  :)
> 
And a inverse sawtooth would run backwards through the wavetable. And
scanning the wavetable with a sine wave - I think that's the whole idea
behind the Casio CZ series synths wasn't it?

The neat thing about the wave tables is that you can run them at sub audio
frequencies as smooth and stepped pseudo random modulation generators.
Using lots of random voltage generators to automatically tweak various
parameters really livens up an otherwise static patch.

Oh yea - I meant ADC not DAC above - Dyslexics Untie!