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

[David G Dixon]

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
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