[A6] Some waveform observations

[Dr. Georg Müller]

Chad Gould schrieb:

> This actually is an unfortunate aspect of the Andromeda... the VCAs that control the
> linear and exponential FM are *not* tuned and calibrated per voice in the standard
> tuning routine. (I believe they are only calibrated during the VCA tune, but still it is not
> coded per voice. I can't quite remember the details. Somewhere in the long lost
> archives is a Mike Peake post with an even more technical explanation, describing
> why these VCAs couldn't be calibrated like the rest [cost reasons I believe was the
> final answer]...)

>From my archive... Georg. (if someone need the files, let me know)

    Betreff: 	Re: [a6] Tuning that FM?
      Datum: 	Tue, 1 May 2001 16:28:18 -0500
        Von: 	Mike Peake <peake at pacificnet.net>
Rückantwort: 	a6 at code404.com
         An: 	a6 at code404.com

>Hey there synth folks...
>
>Working on an Andromeda patch last night, I was attempting to use linear
>and/or exp. FM per voice in order to attempt to get interesting bell / space
>tones out of the machine, working on dual sine wave oscillators.
>
>The results were very good if you limited the patch to one single voice.
>However, the FM was incredible sensitive, to the point that there was some
>signifigant FM variations per note. In order to get a nice harmonic FM tone,
>the FM has to be set at a fairly narrow range. It seemed that the Andromeda
>couldn't consistently apply this FM amount to all 16 voice - if cycled, some
>voices would be noticeably and annoyingly off. This was especially the case
>for exponential FM it seems.
>
>Is this a result of anything perhaps that I've done? Please note that I
>haven't upgraded to the latest OS yet (out of sheer fun and laziness) so if
>this is something that is fixed in future OSs, let me know. :) If this is a
>confirmed fact of analog life, let me know, but it does seem to limit what
>FM can do.

Some of the VCAs in the analog signal path, including these, cannot
be calibrated by the microprocessor. Due to the sensitivity of the
oscillator's pitch reponse, these slight variations result in large audible
variations. Sorry, there's nothing that can be done...

Mike Peake, Your Psychic Friend
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