AW: MS20 Filter Question

[Haible Juergen]

	>What does the opamp in the cv control section do for the circuit?

> (http://www.hyperreal.org/music/machines/manufacturers/Korg/MS-synths/sche
> matics/KLM-307.GIF)
> 
> 
Servo loop for keeping the reference current of the
expo converter constant. It's like an "ordinary" expo
converter as found in many VCOs, only turned upside
down. (Current source rather than current sink)

JH.