> I just found the FAQ:Black
> "Red is used for trigger signals, Blue for DC coupled signals,
> for AC coupled signals, and purple is used for sync."That is inaccurate. The best explanation I've seen was in the old
SMMS owners guide. Unfortunately that seems to have disappeared
from Darrel Johanssen's site.
The colour is not about AC/DC coupling, it is about function. Blue
for
CV, black for audio and bipolar control signals. Some black sockets
are AC coupled (eg most audio inputs), some are not (most audio
outputs, QUO output etc).
> Did you mean, that blue inputs do (usually) ignore negative portionSometimes. The 0 to +5v CV range is generally true for CV outs.
> of the signal? That would be strange, since for example Precision
> VCO has only one black input (and one black output)...
Most CV inputs work over a wider range and sometimes it depends
on the setting of the associated pot.
All the panels I have used are pre 2001 - but I'm not aware that the
colour system has changed since then...
Steve