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@... > 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
1 group owner-moderator