MOTM

>What was the 880?

Here is a snippet that I saved when the 880 was first discussed on 
the list (not written by me):

>Date: Fri, 05 Apr 2002 23:13:31 -0500 (EST)
>From: The Old Crow <oldcrow@...>
>
>   Any MOTM module number ending in 80 represents my work in trying to
>recreate Yamaha IG-series custom chip-based functional blocks in
>standard-component form.  The 480 is the filter, the 880 is the
>voltage-controlled filter envelope generator with slight modifications to
>create a more pleasing module (such as adjustable sustain level instead of
>the CS EG sustain fixed at zero).  The envelope has adjustable initial
>level and attack peak level in addition to the standard attack time, decay
>time, sustain level and release level. One more knob that is not derived
>from the CS EG is a 'shape' control that allows one to adjust the
>curvature of the slope during attack, decay and release portions of the
>envelope cycle.  Finally, there are a manual gate switch, dual-mode LED
>and 'end of cycle' output trigger jack to cascade to other EGs or whatnot.
>All seven knobs have corresponding CV jacks (even the shape knob).  Oddly
>enough, it all fits on a 2U panel.  Oh, this is a *bipolar* envelope
>generator.  The envelope can start below zero, sustain below zero, and end
>below zero, just like the CS filter EG.
>
>   Beware: this is not a cheap module.  Probably $199/kit.  It will kick
>amazing butt though, when all is said and done.