The Yamaha AN1x Synthesizer mailing list

--- 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