Hello John and David,

Am 10.06.2011 12:54, schrieb john m:

> I really like multi-stage envelopes (cz1000, nord modular, etc).
> 8 stages and you select which stage is the sustain. Added cv control
> would be immense.

If there should be a new envelope module, then it should be not reduced
to certain functions like attack or decay or what ever. So I subscribe
to Johns request for a multistage envelope.

There are several stages, basically with an slew time and a destination
voltage. The destination voltage of the last stage is the note-off
voltage. The destination voltages can have values between +10V and -10V.

StageX-Level: this is the voltage to where this stage changes to. The
last stage will have an additional switch to set this level to 0V
(=normal envelope).
StageX-Rate: this is the rate at which the StageX-Level will be reached.
There should be a switch for mid/fast/slow per stage.
StageX-LoopStart: this is an on/off switch. It determines the start of
the envelope loop
StageX-LoopEnd: this is an on/off switch. It determines the end of the
envelope loop

If StageX-LoopStart and StageX-LoopEnd are activated at the same stage,
then you have an normal Sustain.
If StageX-LoopStart and StageX-LoopEnd are activated at the different
stages, the Sustain phase will circulate through the corresponding stages.

The big advantage of this kind of envelope: you can achieve negative and
positive modulations within the same envelope, and the amount still will
be controlled by a simple env amount potentiometer.


Am 10.06.2011 09:02, schrieb david.salter@... :

> I'm a big fan of AD or AR envelopes.

Me too. Mostly I am a big fan of the envelopes of the moog rogue. It has
Attack and Decay as parameters and can be switched between AD and ASR. I
made recently rougly a pcb in eagle for it:
http://fa.utfs.org/diy/a100/rogue_envelope/index.html


Florian