Also according to one of the posters at Muff's Modules
” There is clearly: – no microcontroller/digital/software in sight, therefore it is not any sort of 'emulation' of the filter, as some have suggested – no transconductance amplifier in sight, therefore it is not the later OTA-based MS20 filter – hence by deduction it is the Korg35-based filter of the MS10/early MS20s, and the transistors/JFET are among the discrete components on the board.”
Also according to one of the posters at Muff's Modules
” There is clearly:
– no microcontroller/digital/software in sight, therefore it is not
any sort of 'emulation' of the filter, as some have suggested
– no transconductance amplifier in sight, therefore it is not the
later OTA-based MS20 filter
– hence by deduction it is the Korg35-based filter of the MS10/early
MS20s, and the transistors/JFET are among the discrete components on
the board.”
ie – its the real deal.