Filter Boards - What to chose?

I’m looking to buy a Shruthi-1 kit from tubeohm, and they have the option to order with either a 4PM,SMR4, or Shruthacon filterboard. Can someone explain to me the differences between the different filterboards, and what differences in sound and features each one has?

From Mutable’s website :

" SMR4mkII: 4-pole OTA-integrator LPF
[…]
4-Pole Mission: A clean 4-pole based on the high quality SSM2164, from which are derived 15 different filter responses (LP, HP, notch, allpass…) according to a technique popularized on the Oberheim Xpander. Additional circuitry provides 4 different “flavours” of the resonance self-oscillation, from pure and liquid to chaotic and distorted

Basically, the SMR is the standard Shruthi Filter, with a very nice Roland-ish low pass filter.
The 4PM is a bit more versatile and the Shruthacon is based around the Synthacon filter, which is known for being nasty, see demos here

search a bot on the forum there are loads of threads about this question. And when you have some more information get back here and ask more :wink: