[sdiy] modern AD/DA chips?

[Dave Kendall]

On May 6, 2009, at 20:11, Tom Arnold wrote:
>
>
> At the high end of the scale, it was not repeatable, errors of a few
> hundredths were insanely noticable.
>

Replacing the standard 1K tuning trimmer with a cermet multi-turn makes 
it a lot easier to tune and keep in tune. I found zipper noise when 
sweeping VCFs with 0 to +10V MOD WHEEL CVs to be a problem. Small R/C 
lags  on the CV outs (not 1V/octave) makes it more usable, albeit at 
the expense of some response lag. (how fast can anyone whack a Mod 
wheel up and down anyway?) With pitch bend, zippering is acceptable 
when the pitch bend range is around ±200 cents - any more and you start 
to hear it, and for performance use (actual pitch-bends when playing 
the thing as an instrument) lag is a no go. ±2 or 3 semitones is fine 
for many performance uses though, so it works for me.

Did you have any other problems in 4-voice mode?

IIRC, it can produce some oddities with voices not cycling around 
properly....... (mine is hardwired in mode 1 - monophonic with all the 
trimmings)

cheers,
Dave