[sdiy] Hardware/software LFO Designs

[MTG]

> Your suggested design is slightly different to mine, in that you're 
> talking about a
> variable sample rate, whereas I had a fixed sample rate of 19.5KHz. I'd be
> interested to know what difference this makes, if any.

Oooh. That's interesting. I know regarding VCOs there are various approaches 
using fixed sample rates vs. variable sample rates. Are there any 
discussions online detailing what must by now be a well worn path?

I'm am certainly not going to get that kind of speed. My DAC is I2C and my 
CPU doesn't have hardware I2C, so the best I can get out of it is an update 
every 170us (if I don't do anything else) and that's only a 5.9kHz rate. And 
no extra pins. I'm definitely going to have to scale back my expectations.

GB