Hey all--
I mentioned to Paul that I'd bought a Yamaha SY-2 along the way (in case the
MOTM-485 didn't come to market) for that SY/GX sound. I discovered another
interesting effect in the SY-2 filter-- at high resonance, changing the
pulse width of a rectangular waveform without adjusting the frequency
produces these interesting step-wise changes out of the filter, as though
minor changes in the harmonic structure of the wave (i.e., by changing the
PW) have a substantial effect on the behavior of the filter. At first I
thought something was working wrong in the SY-2! :-) It's an unexpected
effect, I suppose, but one that I happen to like...
Frank,
who's looking forward to MOTM-485s...
-----Original Message-----
From: Paul Schreiber [mailto:
synth1@...]
Sent: Saturday, August 07, 2004 10:32 AM
To: synthDIY; analog heaven
Subject: [motm] Demo of IM distortion in GX-1 VCF
The diode filter in the GX-1 VCF (MOTM-485) exhibits severe IM
(intermodulation)
distortion (around 22%!) at mid-to-high resonance settings.