Doepfer

another way to achieve negative voltages is to change a jumper 
setting in the a176 pcb and make the pontesiometers send a voltage in 
the range of:+2.5 to -2.5.also another cv cource in the a100 system 
is the a155,just stop it in the right step...also the a129/3 if you 
connect nothing to the input cv and turn the offset knob to the right 
will output a constant voltage,right???,this way you have 5 cv 
sources in one module(i am not sure,i haven't try it).if you want 
negative voltages just patch a voltage inverter in between or you can 
use  the invert function of the a166 logic module for the same task...
hope this helps...
bakis.





-- In Doepfer_a100@y..., "buechlerjoe" <buechlerjoe@t...> wrote:
> When I need a negative offset, I patch the A176 CV Source thru the 
> A175 Voltage Inverter.
> 
> Joe
> 
> --- In Doepfer_a100@y..., "duffnuff" <duffnuff@h...> wrote:
> > > Why 
> > > not just use an A138a mixer and the CV source module, like I 
> > >do?
> > > 
> > > Joe
> > 
> > joe
> > great suggestion (duh).  makes sense for fine tuning vibratos, 
> > etc, such as moving a vibrato(lfo) to stay above the osc pitch 
> > rather than symmetrical all the time.  but would this work for 
> > negative offset values?  such as vibrato movement BELOW the 
> > osc pitch?  can you get a negative value from the CV source to 
> > mix w lfo?
> > duff