[sdiy] From a commercial standpoint -- has Eurorack "won"?

[Quincas Moreira]

You can always patch VC control of resonance.  Just send the filter
output to an inverter, then to a VCA, then back into another filter
input.  Voila, control the VCA = control filter resonance.  Some cool
results can be had.  I even did this in a few of the factory presets
for the new Moog Model 15 app.



On Tue, May 3, 2016 at 11:41 AM, David G Dixon <dixon at mail.ubc.ca> wrote:
> Yes, even on an analog modular filter, it is often easier to design a VCQ,
> and then just have a panel pot which sends a fixed voltage to it, and leave
> the VC controls off the panel.
>
>> -----Original Message-----
>> From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl]
>> On Behalf Of Neil Johnson
>> Sent: Tuesday, May 03, 2016 3:23 AM
>> To: Mattias Rickardsson
>> Cc: synthdiy diy
>> Subject: Re: [sdiy] From a commercial standpoint -- has
>> Eurorack "won"?
>>
>> > It's mainly because resonance is not a voltage-controlled
>> parameter in
>> > most filter designs. It's just a potentiometer in the
>> resonance feedback loop.
>> > For one or more of several reasons, few designers choose to
>> construct
>> > a VC replacement for it.
>> >
>> > Unless it's a modern digitally controlled analog synths,
>> then we do it
>> > all the time as Paul M pointed out.
>>
>> Pretty much every analogue polysynth has CV-controlled filter
>> Q.  In most cases this is just another input to a
>> SSM/CEM/IRxxx chip on ht evoice module/board.  Of the ones
>> I've looked at:
>> - Oberheim OBX
>> - Siel Opera 6
>> - Roland MKS-70
>>
>> As to whether you can modulate it with anything other than
>> the setting knob is a separate matter.  It tends to be a
>> voice-common parameter (one CV for all voices) which somewhat
>> limits what makes suitable modulators -- I guess mod wheel,
>> foot pedal, global LFO are about it.
>>
>> Larger polysynths (e.g., Oberheim Matrix 12) with per-voice
>> resonance CVs, and more recent polysnths that off-load the
>> voice control to per-voice microntrollers, make it easier to
>> apply EGs or other note-specific modulation to individual
>> note's filter Q.
>>
>> Neil
>> --
>> http://www.njohnson.co.uk
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



-- 
Quincas Moreira
Test Pilot at VBrazil Modular