[sdiy] Required sample rate for digital envelopes and LFOs

[Dave Manley]

Bruce Duncan wrote:

> No wonder digital envelopes have a reputation for being sluggish.
> On the other hand you can see the level of resources required for the 
> 40uS sample rate on the envelope you recently coded for the Modcan Quad EG.
> A dspPIC uC running at 15MIPs written entirely in assembler with 12bit 
> output and quad serial DAC
> On a synth like the Matrix 12 it would have cost 4 times as much to 
> maintain that level of speed and the power supply requirements would
> have been enormous. Never mind the fact that the cost of equivalent 
> components in the 80s would have been very high if available at all.

As another point of reference it would be interesting if someone could 
stick a scope on a P'08.  Per every two voices there is a dsPIC and 
serial dac that generates 18 control voltages.

-Dave