Is there a difference between LPG and envelopes?

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deeplink
Posts: 294
Joined: 08 Jul 2020
Location: Dubai

Post 31 Mar 2021

Sorry for the weird title but couldn't think of a short way to put this:

Does using an LPG (like in Complex-1) achieve the same effect as,
sending one envelope to both the Amp and Filter?

Is there a sublte but important difference?

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Jackjackdaw
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Joined: 12 Jan 2019

Post 31 Mar 2021

That's the basic principle. But a hardware LPG has a vactrol inside it which I presume the software tries to emulate the behavior of.

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eXode
Posts: 791
Joined: 11 Feb 2015

Post 06 Apr 2021

deeplink wrote:
31 Mar 2021
Sorry for the weird title but couldn't think of a short way to put this:

Does using an LPG (like in Complex-1) achieve the same effect as,
sending one envelope to both the Amp and Filter?

Is there a sublte but important difference?
You kind of mixed the meaning when mentioning envelopes but in short:

A LPG (Low Pass Gate) is basically a combination of a VCA and a VCF, but you can often switch the behavior on a LPG to act either as a
VCA, VCF, or Both.

The LPG comes from the west coast philosophy of modular synthesizers like Buchla and Serge. The filter in the LPG has a roll-off of 12dB/octave (i.e. it's like a 2-pole filter) if I remember correctly. Like Jackjackdaw mentions, a hardware LPG is built from vactrols that contribute to it's characteristic sound.

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