MOTM

>The 190 on the other
>hand does sound more "smooth" (as if the sidebands are more sine shaped,
>less distortion?) and the sounds the blend control creates are awesome.  Is
>this the CS-80 RM effect? 

The circuit is different from the CS-80. The CS-80 uses a 4-quadrant multiplier chip.
The MOTM-490 is a circuit I've designed from scratch, and it's beased on a VCA
(2-quadrant mult) core. If it sounds similar to the CS-80's RM, then it might be because
both are rather "clean" RM designs, using similar linearisation methods on the
multiplier inputs. (Speaking from memory regarding the CS-80.)

The "blend" function was of course inspired by the CS-80. There is nothing like Ring
Modulation on a whole polyphonic synthesizer sound, and the RM quickly faded in
and back to clean ! (Trademark Vangelis sound (;->) ). For even better CS-80 RM
emulation, use a Sine wave from the MOTM-320 and modulate the Frequency
with an Attack/Decay envelope.

JH.