[sdiy] should I BUILD SOME SYNTHS ???

[harrybissell]

Hiya Crystal...

Crystal wrote:

> Harry,
> i think it's a wunnerful idea. switchable would be nice.
> seems like a good first project for my new half fast workstation.
>
> how does it sound (with the mod?)

Sounds really good.  I think I will use this more than the standard Moog
filter.

You need not make it switchable... the two outputs are available at the
same time.  I hacked up the PCB to do it... but you could just add a
little bit of perfboard and get the same result.   What is really cool is
that the new output does not go to infinity like SVF filters (without Q
limiting)
will do...

H^) harry


>
>
> crystal
> (firing up a holiday soldering iron, and a beer)
>
> > lol!
> > while you guys are debating the prose and cons of analog vs
> digitalrecording
> > (I'm with the D boys btw... I use dat)
>  I have been building synth modules.  Most specifically an old EFM VCF 2e
> > (Moog ladder style).
>  I take the buffer output and sum it with the normal LPF
> > output.
> > Now when the resonance is zero, there is no output from the OTA and the
> > LPF
> > is the only signal from the summer.  As the resonance is increased...
> > the LPF
> > passband is dropping BUT the signal from the OTA resonant feedback path
> > is INCREASING...
> > giving a pretty good compensation for the loss of volume.
> >
> > This trick would probably NOT work with the standard Moog style
> > resonance pot (essentially
> > a resistor)... but if you make the pot an attenuator and fed the
> > resoance from the wiper
> > (adding a suitable buffer) it would probably work.
> >
> > Hey what do you think ?
> >
> > H^) harry
> >