Doepfer

hi joe,
and why do you need to add a negative voltage to the
pre out of the a155?i thought that ,in order to use
the a155 as a graphic vco, all you had to do is pass
it thru a filter module to transform its voltage
output to AC.
bakis.



--- Joe Buechler <buechlerjoe@toadmail.com> wrote:
> 
> > i think that the added features of the a-154 would
> certainly expand 
> > the possibilities of using the sequencer as a
> "grahic vco", my 
> > experiments in this area ( both with a previously
> owned serge tkb 
> > and the a-155 ) have led 
> > me to feel that the "graphic vco" idea has merit
> for control 
> > waveforms but 
> > when reaching audio frq`s, there isn`t enough
> variation to merit the 
> > extra 
> > effort - the standard waveform choices provide a
> reasonable spread 
> > of 
> > harmonic series for "day to day" use and the
> addition of things like 
> > linear 
> > fm and various waveshapers ( doepfer a-136 is
> nice, i can also 
> > recommend the 
> > blacet/wiard  mini-wave ) provide enough extra
> waveform variety with 
> > less 
> > effort and less expensive circuitry. 
> 
> I dunno, you've probably played with this concept
> much more than I 
> have. I currently have a bank of Regelwerk faders
> patched to the A155 
> via the A191 so it can be used as a true graphic
> VCO, and biased the 
> pre-out jack with a negative voltage. I can get
> quite dramatic changes 
> in the harmonic content by adjusting the faders in
> real time, and 
> I can also record the waveshaping session on a midi
> sequencer.
> 
> It's possible that I could do something very similar
> with the 
> distortion/waveshaper, but it doesn't seem like
> there would be 
> anywhere near as much control. 
> 
> In any case, it's a lot of fun.
> 
> Joe
> 
> 


=====
synthfreak(parallel worlds)
athens-greece
[Doepfer_a100] group owner-moderator