Subject: Re: [linux-audio-user] Advice for new users?
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Thu Oct 10 2002 - 20:24:29 EEST
On Thu, Oct 10, 2002 at 05:54:01PM +0100, Dave Griffiths wrote:
> > The other thing people should learn from CV sytems, is that frequency
> > is best represented as octaves, eg. 1volt (or 1.0f) per octave.
>
> FWIW: In SSM the whole frequency range maps from -1 to 1 - so an un amplified
> oscillator modulating another oscillator sweeps the entire range.
Yes, this is the problem, the CV value is linear with frequency, not
pitch (octaves). You define 0.0 to be a particular low frequency (say A0)
and then every +1.0 over that doubles the freqency, 1.0=A1, 2.0=A2 etc.
LFO's base frequencies are typically a few octaves down from ocilaotrs to
maintain sensible voltages.
> This could be changed now, as the signals no longer get clamped to that range.
> It would throw off all the FM synth patches I have though :)
Well, FM /is/ done with linear-by-frequency ofcourse, but I glossed over
that ;)
- Steve
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