Filterboard similar to sherman filterbank

I wonder If it is possible make something similar sherman filterbank, For filtering audio signals with shruthi or sideckick.
Thank you for your raplays.

Yo Marco. Shure its possible, just get some OpAmps et al. and go for it :wink:

What do you think is the most important thing in this product? The filter core in itself or all the envelope following / modulations it offers? Because simply doing a filter that sounds similar to it might not be enough… And there’s probably not enough room in the “Shruthi-format” for bringing all the envelope following and modulation functions…

Given that there is no schematics published I have no idea what kind of filter is that (it looks multimode, so maybe it’s just a vanilla 2-poles SVF)…

Any reason to think that it will bring a very different sonic character than the existing dual SVF?

I really think that I can’t do that by myself.
How many filterborad do you think I need (two complete shruthi’s with DSP and polivosks for example?).

Hi, pichenettes. This is the software omologue, it sounds very near to the hardware one.
It is made by audiodamage as vst and this is the link:
I don’t know dual svf (my loss) but I’m here to learn.
I’d like an hardware version on shruthi.

To be clear: what do you need that the existing dual SVF board cannot provide?

No, sorry I don’t know how dual svf works. Perhaps is what I need. I apologise but I do not know how it works and if one board is enough or I need a chain of two or more.

The dual SVF board has two filters. They can be configured as serial / parallel and can process external inputs. You can use the Shruthi-1 mod matrix to program complex cutoff/resonance modulation patterns.

Envelopefollowing would be nice with the sidekick…

Yes on sideckick woul be ok. Can I put svf dual on sideckick without patching firmware?

I’d like to see you patching the SideKicks Firmware :wink:

The Sidekick has no firmware!

If you put the dual SVF board on a Sidekick:

  • You will have to remove the 4053 and put 3 switches inside.
  • You will not have any dedicated control or mod source for the cutoff/resonance of the second filter.

There is no way to get envelope following on the Sidekick / Shruthi. The external audio signal arrives and stays on the filter board.

Just checked the specs for the Filterbank Classic as far as i understand it has no Envelope Follower, just a Detector that triggers the Integrated ADSR Generator.

Building such a thingy that Triggers a Note on the Shruthi via MIDI or the Sidekicks AR Button should be a matter of a WeekEnd…

The only question left for me is why the hell tend people to find a way to use (mostly cheaper) gear in a way it wasn’t supposed to work - hence designed totally different - to achieve things special purpose gear does? Wouldn’t it be easier to just get that specialized gear than to put lots of effort in bending other things?

If I need a screw i get one instead of asking if my nail could be somehow transformed. But thats just me…

Im getting philosophical, if anyone wants to join me on this discussion ill happily make an entry to the “Census of totally derailed Threads Thread” for this one.


I used to have a Sherman Filterbank, and i own a Dual-SVF Shruthi.
They don’t really sound the same (even if with the 0.95 firmware and the coupling mode with offset you can get some similar things).
The Sherman is dirtier, as the filter is made to be overdriven by the input level, and it can self-oscillate, iirc.
Some features i liked a lot on the Sherman was the Amplitude modulation and the analogue FM, which should not be overlooked.

I haven’t yet tried to use my SHruthi as a filter, so i don’t know about the filter’s behaviour when you overdrive the input, and i don’t know if there is a way to make the lfo go up to the audio range ?

Ah, also, it is indeed multimode, but in a very unique way, and you can “morph” from one kind of filter to another smoothly, it is not a switch.

The modulations features were not as outstanding as that, on the Sherman : only one LFO, not so many inputs (for connecting LFO or triggers from hardware gear)… I think the SHruthi might be more powerfull on this side :wink:

Ah I see then it’s probably not a SVF but more a “pole mixing” thing like the Oberheims or this weird Schippman thing. Doesn’t look like it will fit the Shruthi-1 board size / control interface constraints.

“weird Schippman thing”

Yes! Now you’re talking. Can you make me up one of those and have the boards ready for sale by next weekend, please? Thanks!

If you want something like the Filterbank, but build it yourself, perhaps Oakley’s Filtrex II could be of interest?

I thought it is already sold out??!?

But back in stock in April they write…