[sdiy] How to continually blend from a parallel connection of thetwo multi-mode resonating filters?

[Dave Leith]

Hi Michael

Thanks for your thoughts, most appreciated....Currently I have the
Ladder filter build, board for 1047 waiting for some parts to come in.
When that's done I'll patch the the filters into an existing vactrol
cross fader in another panel and see what makes sense. The multimode
filter will be patchable, but for the most part I also normalize the
inputs on my panels to what I think will be most useful - so not sure
which multimode I'd chose maybe hi-pass or bandpass???

As for running the two filters - good point - the Sherman has a way to
link the the main frequency controls- so that's probably a good idea
(thanks). As for divergence/spacing I think I'd go the Sherman route
which is having some combination inverting/non-inverting inputs
controls for frequency. This does get complex quite quickly-especially
with the multi modes. Have to admire Cynthia's solution :-) In any
case I'll do some experimentation with the 2 filters, crossfader and
some alligator clips before I commit to a panel design.

Here's what the panel design currently sits at (still missing a
frequency linking switch) http://davidleith.com/Panel-Design_3.gif
Other synth building stuff you may find interesting at
http://minimalist.davidleith.com/DeitzModSynth2.html

Really appreciate any comments from any and all on this. I'll keep you
posted on development. Slated to be finished this summer.

The vactrols do a number of different crossfading chores to blend
waveforms on the 259.

Dave

On 6/9/09, Michael Zacherl. <sdiy-mz01 at blauwurf.info> wrote:
>
>  Hi Dave,
>
>
> > the 2 filters are an clone of the ARP 1047 (from Arp 2500)
> > multimode filter and the Arp 4012 (moog  ladder) Could be a very nice
> > timbre envelopes happening.
> >
>
>  that's very interesting! How will you handle the frequency controls?
>  Some combinations will require the same cut-off point in order to work.
>
>
> > I have good circuit using Vactrols to do
> > crossfading from the Buchla 259.
> >
>
>
>  Vactrols would be a neat option. I've to lookup the 259 circuit.
>  I'm really curious about the results you get especially because you use
> different filters in your setup.
>
>  I had some intense thoughts on combining filters almost a year ago I but
> put it asleep since I simply got too complicated.
>  (Tom Wiltshire maybe will remember ;-)
>
>  Until now ...
>
>    cheers, Michael.
>
>
>
>
>  --
>  noise chasers: http://blauwurf.at/current
>
>