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Post by admin on Dec 22, 2018 12:27:44 GMT
This is a low pass gate based on a Vactrol and has two inputs: IN (audio signal) and TRIG. A pulse on the TRIG input opens the signal path shortly and via the characteristics of the vactrol the audio signal is filtered and attenuated in a plucked, percussive way. For purchasing and more information please visit www.tangiblewaves.com/store/p62/LOPAG_%28lowpass_gate%29.html |
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Post by 101 on Jul 9, 2019 20:09:30 GMT
I like my LOPAG. But I'm curious as to what the Trigger output pin does. Is it The Trigger input being passed through?
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Post by robertlanger on Jul 10, 2019 8:16:41 GMT
The trigger on accepts any kind of signal that is internally shaped to a sharp, short pulse. This pulse is made accessible at the trig out socket; maybe it's useful here and there was my thought.
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Post by NightMachines on Jul 10, 2019 9:39:45 GMT
The trigger on accepts any kind of signal that is internally shaped to a sharp, short pulse. This pulse is made accessible at the trig out socket; maybe it's useful here and there was my thought. Nice! So it’s a proper gate (or whatever) to trigger converter  |
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Post by 101 on Jul 10, 2019 10:17:42 GMT
OK thanks - the Trigger out is just the Trigger input passed through for use elsewhere
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Post by dizzeesatchel on Sept 21, 2020 20:09:07 GMT
Hello! I'm pretty new to modular, so forgive me if i'm not grasping all the basics, but i'm curious about the use of the Gate and CV inputs on the LOPAG. The wiki doesn't have a lot of information about this module, so while i've experimented with them and observed the changes in sounds, I'm not quite sure what's the theory behind them. Is anyone able to explain or demonstrate interesting uses for these inputs? Or how to get the best from the LOPAG in general? I'm very much enjoying the plucky goodness I've got from it so far  |
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Lugia
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Post by Lugia on Sept 22, 2020 1:19:52 GMT
Hello! I'm pretty new to modular, so forgive me if i'm not grasping all the basics, but i'm curious about the use of the Gate and CV inputs on the LOPAG. The wiki doesn't have a lot of information about this module, so while i've experimented with them and observed the changes in sounds, I'm not quite sure what's the theory behind them. Is anyone able to explain or demonstrate interesting uses for these inputs? Or how to get the best from the LOPAG in general? I'm very much enjoying the plucky goodness I've got from it so far Lowpass gates were something Don Buchla came up with at the very beginnings of his synth design career. What they are are a lowpass VCF coupled to a VCA. And how they work is that you feed either a gate/trigger pulse (for ON-OFF envelopes) or a modulation CV (to impose an envelope, or add tremolo via an LFO, etc) into the control side, and your audio in the...audio side. When the LPG gets the control signal, the VCA and VCF both follow that incoming signal via a vactrol, an optical element that has a certain degree of "hysteresis" to it so that it doesn't SNAP closed, but sort of "sweeps" into silence according to the modulation signal. As a result, the loudness and formant contour of the incoming signal are processed simultaneously, which Don thought was closer to how an acoustic instrument deals with those factors. |
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Post by dizzeesatchel on Sept 22, 2020 8:34:11 GMT
you feed either a gate/trigger pulse (for ON-OFF envelopes) or a modulation CV (to impose an envelope, or add tremolo via an LFO, etc) into the control side
Ah! So the gate / cv inputs are - at least in part - alternatives to using the trig input? Ok, that helps, thank you! And good tip about adding tremolo. I think I get it now. Looking forward to experimenting further with this |
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Lugia
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Post by Lugia on Sept 23, 2020 2:10:57 GMT
you feed either a gate/trigger pulse (for ON-OFF envelopes) or a modulation CV (to impose an envelope, or add tremolo via an LFO, etc) into the control side
Ah! So the gate / cv inputs are - at least in part - alternatives to using the trig input?
Yup! Gate will give you an on/off envelope, like what you get on some Rolands by switching the VCA over to GATE mode. Modulation lets you impose an actual envelope signal. LPGs are at their best, arguably, when you have short duration sounds. They give you that Buchla-esque woody "plook" sound...very awesome for percussives, especially with a noise source. |
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Post by tIB on Sept 25, 2020 16:46:03 GMT
A dual lopag would be something... any chance of that I wonder?
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Post by funbun on Sept 30, 2020 16:01:51 GMT
As a result, the loudness and formant contour of the incoming signal are processed simultaneously, which Don thought was closer to how an acoustic instrument deals with those factors. Ah, so that's why low pass gates sound so "real/organic." |
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Lugia
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Post by Lugia on Oct 1, 2020 1:54:49 GMT
As a result, the loudness and formant contour of the incoming signal are processed simultaneously, which Don thought was closer to how an acoustic instrument deals with those factors. Ah, so that's why low pass gates sound so "real/organic." Exactly! The idea was that, since higher partials have less energy in a mechanical instrument, they're the first to drop to silence. So the result is like watching a waterfall display of, say, a piano...everything's up at the attack, and the partials die off as time passes from the attack to the end of the decay in the same way. |
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Post by MaxRichardson97 on Nov 1, 2020 12:10:47 GMT
I got hold of a LOPAG yesterday and am struggling to get it to sound plucky - the trigger input is a really, really short sound - is that right? It's great using with gate/CV but the trigger is almost imperceptibly fast!
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Post by 101 on Nov 1, 2020 16:18:40 GMT
you can also put an envelope output into the gate for a longer sweep.
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Post by MaxRichardson97 on Nov 1, 2020 16:46:36 GMT
you can also put an envelope output into the gate for a longer sweep. That's exactly what I've been doing - the trigger sound is just too short, I can't hear the note - only the sound of the trigger like a pop |
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Post by 101 on Nov 1, 2020 23:02:06 GMT
Set to VCA?
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Lugia
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Post by Lugia on Nov 1, 2020 23:07:50 GMT
Ahhh...yep, there's another use for the LPG. Now, take that audible 'pop' and send it on to the DELAY. Set the DELAY so that it's at an EXTREMELY short time, and just before the feedback breakthru point on the FEEDBACK control. Then output that to either another LPG (using GATE for control this time) or a VCF/VCA discrete arrangement to shape and filter the DELAY output. Voila! Poor man's Karplus-Strong synthesis!
And yes, you CAN CV this...but I'd strongly recommend an attenuator in the path from your pitch CV source to the DELAY's CV IN to rein in the scaling. Sorta touchy, but doable!
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Post by MaxRichardson97 on Nov 2, 2020 0:43:32 GMT
I think maybe I'm not describing myself too well - when I feed sound in, the trigger input makes the sound just too short, it doesn't sound plucky, more poppy, almost just like it's the sound of the trigger itself with no decay. I can't figure out if I'm doing something wrong or not! Using an ENV into the gate works great, but can't figure out the trigger input. |
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Post by 101 on Nov 2, 2020 1:31:27 GMT
I tend to use my LOPAG nearly always with VCA setting, if using just the trig input. I've also found that the LOPAG does'nt always reliably fire if using a Gate type output at the trig input. But it works 100 percent if using the trig outs from the Topograf.
Also maybe try feedng the LOPAG In, from the Nand output of the Logic module. Sort of extremify your input.
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Post by Gaëtan on Nov 2, 2020 7:30:37 GMT
I think maybe I'm not describing myself too well - when I feed sound in, the trigger input makes the sound just too short, it doesn't sound plucky, more poppy, almost just like it's the sound of the trigger itself with no decay. I can't figure out if I'm doing something wrong or not! Using an ENV into the gate works great, but can't figure out the trigger input. Can you post a recording ? LPGs can sound different from each other, but it shouldn't be imperceptibly short. When I hit my LOPAG with a trigger, the sounds lasts probably around half a second.
Just so that we are on the same page, do you plug it this way : Sound source > IN Trigger > TRIG Asking because it sounds like you might send the trigger to IN.
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Post by MaxRichardson97 on Nov 2, 2020 9:50:17 GMT
I think maybe I'm not describing myself too well - when I feed sound in, the trigger input makes the sound just too short, it doesn't sound plucky, more poppy, almost just like it's the sound of the trigger itself with no decay. I can't figure out if I'm doing something wrong or not! Using an ENV into the gate works great, but can't figure out the trigger input. Can you post a recording ? LPGs can sound different from each other, but it shouldn't be imperceptibly short. When I hit my LOPAG with a trigger, the sounds lasts probably around half a second.
Just so that we are on the same page, do you plug it this way : Sound source > IN Trigger > TRIG Asking because it sounds like you might send the trigger to IN.
Cheers! That's exactly how it sounds, it sounds just like the audio of the trigger. I'll ping a video over later - thanks! |
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Post by MaxRichardson97 on Nov 2, 2020 11:51:51 GMT
I think maybe I'm not describing myself too well - when I feed sound in, the trigger input makes the sound just too short, it doesn't sound plucky, more poppy, almost just like it's the sound of the trigger itself with no decay. I can't figure out if I'm doing something wrong or not! Using an ENV into the gate works great, but can't figure out the trigger input. Can you post a recording ? LPGs can sound different from each other, but it shouldn't be imperceptibly short. When I hit my LOPAG with a trigger, the sounds lasts probably around half a second.
Just so that we are on the same page, do you plug it this way : Sound source > IN Trigger > TRIG Asking because it sounds like you might send the trigger to IN.
So this is a recording of the trigger input and the gate input (which works a little better!) fed by a TRIQ164 filtering the sound of a sawtooth VCO - I think there could be something wrong with my module possibly - or I'm doing something wrong! Here's a photo of the patch too:   |
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Post by dizzeesatchel on Nov 2, 2020 12:07:25 GMT
soundcloud link isn't working for me, but have you tried feeding in different wave shapes? I think square waves tend to work better for me
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Post by MaxRichardson97 on Nov 2, 2020 12:33:19 GMT
soundcloud link isn't working for me, but have you tried feeding in different wave shapes? I think square waves tend to work better for me Apologies, tracks were private! Sorted. I have tried with square, it all sounds very short and poppy. |
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Post by Gaëtan on Nov 3, 2020 6:46:49 GMT
I still can't access the link
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