--- In
AN1x-list@yahoogroups.com, "Jerry Aiyathurai
<tuskerfort@h...>" <tuskerfort@h...> wrote:
> Are the AN1X enveloples linear or non-linear? Is there any
difference
> between the pitch envelope and the filter envelope in this
regard.
>
Liner v non-Linear? Couldn't say but..
> Is it my imagination, or is the pitch envelope logarithmic and
the
> filter envelope linear?
>
..bear in mind the AN1x has only a Depth & Decay setting for the
PEG (as opposed to the PLG150AN which has an added Attack
parm.)
The FEG is a full fledged ADSR (attack, decay, sustain, & release
parms.)
> I was doing sync sweeps with envelopes, and I "thought" that
when I
> engaged the pitch envelope, the sync moved very fast in the
early
> stages and then started to slow down. But the filter envelope
(for
> roughly the same decay time and depth (zero attack) seemed
to give a
> more leisurely, even sweep.
See above. The PEG is behaving how you think it is.
A dedicated ADSR (or better) EG for Pitch is not common too
many synth - late model Ensoniq synths had very sophisticated
Tiem and Rate envelopes for Ptich, Amp & FC and I wouldn't be
surprised if the Kurzweils did too. It's been a few years since I've
had hands on time with a KORG and my memory fails me.
>
> So I tried the envelopes out with pitch sweeps. I dialed in a
slow 2
> octave pitch sweep with the pitch envelope. It seemed that the
1st
> octave of sweep happened much faster than the second. Then
I self
> oscillated the filter and tried running through about 2 octaves of
> pitch (zero attack, decay time corresponding to decay on the
pitch
> envelope), and it seemed much more even. But I was relying
on my
> (awful)ears.
>
> I'd love to know what you guys think. Is there a test we can do,
that
> would allow us to view the shape of the envelope? Or would
one of you
> try the audio test I described and tell me what you think?
>
> Sorry for the nerdy question. The difference (if any) could be
quite
> important for the synthesis of plucked and struck sounds,
> particularly those with FM or sync where you have a choice of
> envelopes.
>
> Thank you,
>
> Jerry
regards,
Jon