Doepfer

Hi bakis

You're right about that. It works without the negative voltage. Just 
being anal, I guess.

Joe

--- In Doepfer_a100@y..., bakis Sirros <synth_freak_2000@y...> wrote:
> 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@t...> 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