Dear Dieter,

Thanks, found the pot (p8), and am playing around to find setting(s)
I like. It's an awesome filter by the way.

Cheers Martin

>
> Martin,
>
> there is a trimming potentiometer on the A-108 board that is used to

adjust

> the resonance so that self-oscillation just appears at the full

clockwise

> position of the resonance control. This trimming potentiometer is

adjusted

> for the default feedback (48dB output). If another output is used for
> feedback the levels and phase relations are a bit different and you

obtain a

> different resonance behaviour as the setting of the trimming

potentiometer

> is optimized for the default 48dB feedback. This is why you have to

amplify

> the signal. You could try to re-adjust the trimming potentiometer

for the

> 24dB feedback loop but then the setting is not optimal for the

default 48dB

> feedback loop.
>
> Best wishes
> Dieter Doepfer
>
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von marrtin606
> > Gesendet: Mittwoch, 31. Mai 2006 21:01
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: 1 Re: resonance for a108 when feeding 24db

output

> > into feedback input
> >
> >
> > Dear Ingo, Bakis,
> >
> > you're of course right I don't need the feedback to get some form of
> > resonance - but the point was to understand why i couldn;t get
> > resonance using only 4 poles.
> >
> > I'm pretty sure the feedback is internally patched to the 48db -
> > apart from the manual and schematics suggesting this, you can also
> > try this by directly patching the 48db out to the feedback in: you get
> > just the same as when nothing is plugged into the feedback in.
> >
> > > if you want, of course, you can patch the res input
> > > with any of the filter outputs, for different
> > > resonance behaviour.
> > > regards,
> > > Bakis.
> > >
> >
> > That was precisely what i was trying to do, but didn't get much
> > resonance. And that surprised me, because 4 poles/24db should be
> > sufficient for that.
> >
> > I found out now that if I amplify the 24db signal a bit before feeding
> > back (with a vca or externally), I also can get into resonance using
> > only 4 poles. I'm still curious to hear what other 108 users find!
> >
> > Cheers Martin
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>