They all use the same OTA filter based on BA662 chips.
This design comes from the System700 OTA filter based on CA3080 chips.
You can find the same filter as the 700's in the SH1 only.
The System100 has a different filter design as it uses a transistor filter like the SH5.
Roland eventually came back to a transistor filter with...the TB303.
Cheers
Olivier
P.S: hope my English is clear enough.
David Bulog wrote:
Hi does anyone on the list know if SH2 or SH09 uses a custom IC for
each of the VCOs or is discrete off the self components like System
100 101
My other question is would the SH2 be similar in sound to a System
100m three module combo consisting of 112,130,140.
The SH-2 is the only Dual VCO Roland apart from SH5/7 that is still
reasonably priced
thanks in advance
David