--- In Doepfer_a100@yahoogroups.com , "shm1400" <shm14@h...> wrote:

> Sorry to appear dim. But what the #$%@! is a through zero FM VCO
>

Here is a little something on the topic of thru-zero FM.

http://www.uni-bonn.de/~uzs159/vco6.html

Enjoy,

Matthew