[sdiy] Sunsyn,PPG wavetable oscillator.

[Karl Dalen]

Hi!

The sunsyn specs says that you can set a relative frequency of the RCO
to the VCO, still the RCO wavetable follows the VCO sawtoth wave,
(i suppose the sunsyn uses the AD tehcnique).

Is it done by sawtoth multiplying up or down? The chance of getting
a glitch/spike in the middle of the saw is quite high , it would need
careful amplitude calibration over the freqency range and that
technique would give only octaves of frequency change but
would maintain table length.

Or by sample skipping, e.g every even number of skipp (2,4,8 etc.)
would shorten the table and raise the frequency in stepps! Any 
ideas on how this is done in the sunsyn? I wonder what bit depth
the sunsyn use,16bit AD seams a bit expensive knowing that there
are 16 RCO in that box'!

I also wonder if anyone have the PPG wavetables to share?
Im brushing of my old wavetable oscillator for an uppgrade.

I also had the idea to extract off the SQ80 and the K4 waves.
The  K4 waves would be particularely interesting but i have
to figure out a easy way to compress these waves from 16 bit to 8bit!

Regards
KD

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