Lopass gate

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haricots
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Post by haricots » Wed Feb 17, 2010 2:40 pm

I built one of these a while ago and love it but I'm not sure I understand the concept of the 'ring'. Are you referring to the loosness of the decay? Is it more common to inject a straight gate into it or an enveloped signal like you would with a filter or VCA?

BTW, it's a really easy build even for a hack like me. I have two more pcbs sitting around in hopes of building a dual at some point.

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megaohm
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Post by megaohm » Wed Feb 17, 2010 3:08 pm

haricots wrote: Is it more common to inject a straight gate into it or an enveloped signal like you would with a filter or VCA?
By all means, slap it around with triggers!
It's one of the coolest things about using vactrols.

p.

sandyb

Post by sandyb » Wed Feb 17, 2010 4:43 pm

haricots wrote:I built one of these a while ago and love it but I'm not sure I understand the concept of the 'ring'. Are you referring to the loosness of the decay? Is it more common to inject a straight gate into it or an enveloped signal like you would with a filter or VCA?

BTW, it's a really easy build even for a hack like me. I have two more pcbs sitting around in hopes of building a dual at some point.
i usually use a short(ish) length AD envelope. i like being able to vary the attack and decay separately to get the sound i'm after. triggers work well but don't give you this option.

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pugix
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Post by pugix » Wed Feb 17, 2010 7:25 pm

I have two of these.

http://pugix.com/synth/resonant-lopass-gate/

Has anyone else used the VTL5C4 vactrol for it? It's slower response makes it less 'slappable'. I might switch.
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sduck
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Post by sduck » Wed Feb 17, 2010 11:29 pm

I've built 4 of these - and used the vtl5c4 in one of them. I prefer the ones with the 3 most of the time, but sometimes the 4 is fun and cool sounding.
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doctorvague
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Post by doctorvague » Thu Feb 18, 2010 8:44 am

haricots wrote:I built one of these a while ago and love it but I'm not sure I understand the concept of the 'ring'. Are you referring to the loosness of the decay? Is it more common to inject a straight gate into it or an enveloped signal like you would with a filter or VCA?
Yeah there is a natural decay they have- even if hit with a short square trigger it sounds like it adds a decay stage. That's part of that 'bongo sound'. Different vactrols have different ring (and attack too for that matter) - there's also a short non-instantaneous attack rise that contributes to the sound and there's the overall response curve too.
It's common, especially in Buchla land, to hit these with triggers and let the vactrols make the 'envelope' but you can also use an AD or ADSR of course. The LPG can be the filter, VCA and sort of an envelope all in one. :yay:

My favorite sounding vactrol is the Silonex NSL32-SR3. It's pretty fast as far as vactrols go. As a slower alternative to the VTL5C3 I always thought one of the common choices was the VTL5C2, not necessarily the VTL5C4. I've messed extensively with the others but have never used the VTL5C4 myself.

When I first read about the dual vs single vactrols I thought you were replacing the dual with 2 singles, not one single, that's why I thought the LED circuit might need tweaking (doubling the number of LED's). But according to the diagram, if you're swapping one single for one dual then it makes no difference. What's changing is only the photocell/resistance side of the circuit. Unless I'm misunderstanding something.

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snoop
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Post by snoop » Thu Feb 18, 2010 11:52 am

The deal was to replace one dual with 2 single vactrols, yes. My LPG should arrive anyday now. Will post some demos. I only make percussion and loops with my modular, so it will be... percussion sounds :-)

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