an idea ...

[Ray Peck]

Kimmo Koli writes:

>Why not toggle with a push button between the memory CV and the knob CV. If
>done with CMOS-switches and logic, you could reset the toggle switch every
>time a patch is recalled from memory.

Because I want to tweak the presets.  For me, preset means "starting
point", not "fixed sound".

>Or make a derivate of the knob voltage to switch the control from patch 
>memory to the turned knob. And then show with a red/green LED when knob 
>position matches with the patch memory...

Mm.

If the knob didn't do anything until its position matched the preset,
this might work OK.  I'd hate for the setting to jump as soon as you
touched the knob.

>Why use D/A-converters for CV-control ? A 100 kHz variable pulse-width signal
>(or even better a tri-state signal = double resolution) could be easily 
>generated with software. A microprosessor would update 8 of these at the 
>same time with one parallel port and 8 RC low-pass filters. Should be 
>quite clean DC for controlling VCOs and VCFs. The settling time and 
>resolution can be adjusted by the RC time constant independently for each 
>CV-output. An for lower noise these bit-streams could be opto-coupled. 
>Or make differential outputs...

I have to think a bit on how that would work.  Thanks for the ideas!