To use CEM or not.

[WeAreAs1 at aol.com]

In a message dated 9/21/99 9:38:25 AM, you wrote:

<<Seems like I heard the 3320 was not that great a filter, but I could be
wrong. Must be some reason there are soooo many left....Maybe phasing is
it's forte?>>

It's the chip used for Lowpass filter in the Oberheim OBxa and OB8, as well 
as the Sequential Prophet V (rev 3.0 and up) and Pro-One.  None of these are 
really raved about by those in the know, but they're certainly not terrible, 
either. (the older Rev 1 and Rev 2 Prophets had the legendarily sweet SSM2040 
filter chip)

Voce used the 3320 in Allpass configuration in most of their Hammond/Leslie 
simulator products, as a Leslie simulator.  As far as I know, Voce was one of 
OnChip Systems last regular customers for new parts.  That's probably why 
there are so many of them left over - it was a relatively recent production 
run.  I think Waldorf was also using 3320's in some of their products of the 
last decade: possiibly in the first MicroWave and maybe even in their big 
Wave synth.  (they might even still be using them...)

Anyway, there are six 3320's in the Voce "Spin" Leslie simulator (three for 
the Left signal, three for the Right, each side also split into low/high 
frequency bands).  However, the way they're using it and the way they're 
modulating it, it doesn't really sound like a phaser, but it's pretty darn 
good as a fake Leslie - especially considering that it's all analog.  One of 
these days I'm gonna go in there and reverse the circuit to see what they did.

Michael Bacich