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Thoughts on Resonant Lopass Gates
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author Thoughts on Resonant Lopass Gates
fitzgreyve
I've had the parts in stock (vactrols, 3 position switches) for a pair of LPG for a while, and am now contemplating doing something with them.

I generally like to "design my own" !

As I only need two, if I use my normal PCB supplier I will end up with at least 8 spares sets (PCB and FR4 panel) to dispose of.

Is there any combination of LPG features that's not currently available that would be useful to anyone ?
MapacheRaper
You mean passive or active LPGs?
Silesius
Quote:
Is there any combination of LPG features that's not currently available that would be useful to anyone ?


I built mine combining a classic Lpg with a clean hifi Vca (2181 based). With a switch you can select the one you prefer. They also have a velocity input. When in vca mode, the input is used for level control; when in Lpg mode, the input is used to ping the Lpg.
JakoGreyshire
Inverted feedback for resonance control....
fitzgreyve
MapacheRaper wrote:
You mean passive or active LPGs?

Active

JakoGreyshire wrote:
Inverted feedback for resonance control....

Nice idea - I've not seen that implemented anywhere ?
woodster
The Craig Lee LoPass Gate had VC Resonance.

http://clsound.com/vcresonantlpg.html
JakoGreyshire
That's cool about the Craig Lee Module.....

I hadn't looked real hard for that feature but I discovered it when I bought a Make Noise LxD and was watching some of make noise;s videos on it...

There is an advanced patching video from make noise that got me into trying the inverted feedback thing... I liked it so much that I made my own simple video of it.... Now I'm thinking of trying it with the optomix..

If I recall correctly, I ended up using the sustain knob on the contour section of the 0-coast to control the resonance....

Er, umm, I'll just post a link here in case someone wants to check it out...
And a link to the original make noise video is in the description notes...

https://www.youtube.com/watch?v=Nse-Da_xTyU&t=
diablojoy
Hmm 2 x cv inputs with an attenuator on at least one of them is very useful.
and another vote for vc resonance.
fitzgreyve
THanks for all the great ideas.

I'll start looking at pulling a design together that combines:
- still has the three separate modes: VCA/VCF/VCA+VCF (switched)
- 2 separate CV inputs, one with attenuverter
- separate "strike" input, ideally with a built in trigger pulse duration control
- VC resonance (probably vactrol)
- inverted feedback option
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