Multistage Envelope

[FlowerP]

In the General Discussion thread about a new G2 OS version, I wished for a generic chainable envelope module. Dasz suggested the AD/R module could be used and PM:d me an example. Here is another version of a DIY multistage envelope. The "pre-sustain" stages (Attack-Decay) can be chained in any number (within the limits of patch load and memory). The "post-sustain" stages (Release) can also be chained.

Each stage consists of a simple ASR envelope controlling a crossfade module. When the envelope reaches +1 the next stage is triggered. The crossfader fades between the level from the previous stage and the current stage level.

This patch is of course quite absurd. Its patch load is reasonable, but the memory load is 31 % for just a 6-stage envelope! Not very usable in real life!

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DIY MultistageEnv.pch2
Description:		Download
Filename:	DIY MultistageEnv.pch2
Filesize:	2.79 KB
Downloaded:	269 Time(s)

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[dasz]

The thing I haven't patched would look like this (in series)

1. Level 1 - knob - start level - added to 3. to set output level
2. AD/R (attack stage) - invert it if Level 1 > level 2
3. multipler - modulated by Level 2 - Level1 Depth
4. multiplexer which selects this stage
5. Level 2

Repeat 1..4 for addtional stages. Yes, hard to patch and does take power to accomplish. I suppose you wouldn't need an AD/R Module but a Decay module (since we are inverting each ramp based on which direction it needs to go). Still a lot of hassle.

I did ask for gate out for all env's a long time ago. Especially on the multienv envelope which would be ideal for this ...
/Dasz

[davep]

Hi Guys,

Here's an idea for an eight stage envelope. It uses a X-FADE MUX module to sweep through eight DC levels supplied by a set of contant modules. The ADSR below the MUX controls the rate at which it sweeps through the levels, and it also controls which position gets used as the SUSTAIN portion (setting the ADSR sustain level lower causes the mux to sweep through more of the steps and stop on a later step during the sustain).

Of course this one has a few major limitations. Most notably that you don't have individual controls for the individual ramp times, only their levels. I would also like to see a true multistage EG with at least eight steps, with time & level controls for each segment.

A few other ideas - sweep a control sequencer with an EG and send the output through a lag module or lowpass filter to smooth it. You could then modulate this lag or filter module with a SECOND EG or sequencer to vary the smoothness/sudden jumps between steps.

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MUX as 8stage EG.pch2
Description:		Download
Filename:	MUX as 8stage EG.pch2
Filesize:	1.49 KB
Downloaded:	268 Time(s)

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[Blue Hell]

Made a sketch based on Dave's idea, it would need some additional logic to make it a real EG. It seems not too expensive for 16 stages, so maybe it has some potential.

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e-m-s-e.pch2
Description:	experimental-multi-stage-envelope	Download
Filename:	e-m-s-e.pch2
Filesize:	1.69 KB
Downloaded:	323 Time(s)

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[iPassenger]

Another idea:

What about using an LFO to control the steps on the control seq, that way you can have the envelope tempo locked. My lack of logic skills mean i can't work out how to disengage the lfo after one loop but i presume it can be done. (trying now)?

R.

Worked it out:

EDIT: Oh sorry Jan, i see you had already done that. Doh!

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LFO 16 ENV.pch2
Description:		Download
Filename:	LFO 16 ENV.pch2
Filesize:	1.73 KB
Downloaded:	289 Time(s)

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[Blue Hell]

[dasz]

that's funny, I just added the value switch to my patch for gating the patch with a midi note (stereo pair, thus the need to double the toggle button functionality without needing to toggle 2 buttons). A handy module indeed.
/Dasz

[FlowerP]

Here is a slightly revised version of my MultistageEnvelope. Using an inverted keyboard gate signal as trigger for the release stages caused those stages to activate immediately on loading the patch. By adding a RS-flip-flop and gating the keyboard gate signal, the envelope release stage can not be triggered before the first keypress.

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DIY MultistageEnv2.pch2
Description:		Download
Filename:	DIY MultistageEnv2.pch2
Filesize:	2.85 KB
Downloaded:	254 Time(s)

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[FlowerP]

Some rapid changes are taking place with this patch. This is yet another revision. A few redundant modules have been deleted. Now the memory load is down to 28 % for this 6-stage envelope.

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DIY MultistageEnv3.pch2
Description:		Download
Filename:	DIY MultistageEnv3.pch2
Filesize:	2.72 KB
Downloaded:	259 Time(s)

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[tim]

Régardez ici

http://electro-music.com/forum/post-121585.html#121585

[Blue Hell]

and here : http://electro-music.com/forum/post-121884.html