[sdiy] Roland SH-3A "chorus"

[jh.]

I spent a nice afternoon today with a friend who brought
his SH-3A. I was surprised how good this sounds, for
a single-VCO synth.

The " 8'-Chorus " function plays an important role in this.
Sounds a bit like PWM, but not what I exaclty would expect from
PWM. How is this done ? Are the schemos online somewhere ?

The filter is a Moog-ladder as far as I could tell, btw.
Thought I read somewhere they'd changed it from the
-3 to the -3A. But this -3A definitely had a Transistor ladder.

JH.