[sdiy] Yamaha CSY-2 solo synthesizer

Richard Atkinson rga24 at cantab.net
Wed Nov 10 20:51:25 CET 2010

Hi Colin,

>...unless those Rohm ICs are really transistor (or diode) arrays, and the
>filters *are* essentially a re-hash of the contents of the NE modules.
>Or even a discrete prototype of the topology used later in the IG chips.
>There's a project for you ;-)

Indeed. Even if they are similar circuits, it's not unreasonable for them 
to sound different from either the NE diode bridges or the IG state 
variable filters. After all, SSM2040s are simply quad cascaded OTA filters, 
as are some IR3109 and CEM3320 configurations, but no-one accuses them of 
sounding the same :)


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