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ThreeTom Modular - Steve's MS-22 Dual VCF (4HP)
MUFF WIGGLER Forum Index -> Eurorack Modules  
Author ThreeTom Modular - Steve's MS-22 Dual VCF (4HP)
Hi, my name is Tom, and I’m the guy behind ThreeTom Modular Synthesizers, a small Eurorack business based in Belgium. The past few months I've been developing a rather unique take on a dual VCF module. As I'm getting ready to release, I thought I'd make some noise about it here :

Steve's MS-22

A dual voltage controlled filter (inspired upon the classic Korg MS-20 OTA design) with an innovative modulation matrix and one of the highest function-to-hp ratios in the land of Eurorack. This module was inspired by many pleasant chats with tech journalist Steve O’Hear and is currently being prepared for release. Have a look below at the pictures, demos, specifications and block schematic!

Please note that the final units will have black knobs for all controls!

General features
  • Dual VCF inspired by the Korg MS-20 OTA filter
  • Low-pass (12dB) into high-pass (6dB) configuration
  • Innovative modulation matrix allows CV control over all parameters
  • Cut-off frequencies can be linked, resulting in a band pass filter with controlable bandwidth
  • Bipolar monitoring LEDS for the LP, HP, resonance and gain CV signals
  • One of the best functionality-to-size ratios in Eurorack with a width of 4 HP and a depth of 45 mm

  • Filter input
  • Filter output
  • Frequency CV input (FCV)
  • Auxiliary CV input (ACV)

  • LP cut-off frequency (“frequency”)
  • HP cut-off frequency / BP bandwidth (“spread”)
  • Resonance : from mild to screamy
  • Gain : from warm to asymmetrical saturation
  • LP Frequency CV (FCV) attenuator
  • Auxiliary CV (ACV) attenuator
  • LP-HP link switch : 0%, 50% or 100%
  • Modulation Matrix switches, routing ACV to HP cut-off / spread, Gain and resonance : +ACV, off, or -ACV (inverted)
  • Calibration trimmers for the HP and LP filter are available from the side of the module.

  • Designed to work with unipolar +5V or bipolar +-5V modulation sources
  • Will also take unipolar and bipolar 8 and 10V modulation signals, but this results in a smaller usable range on the ACV and FCV attenuators
  • Low frequency and audio rate modulation of all parameters
  • Bipolar monitoring LEDs (green: positive, red: negative) for all CV destinations (LP cut-off, HP cut-off / spread, resonance, gain)

  • 4 HP wide
  • 45 mm deep (skiff friendly)
  • High quality aluminum knobs with grippy surface
  • 2 mm thick matte black front panel with white and metallic print
  • A tasty 4-layer PCB sandwich, containing 350+ components
  • Recessed power connector, avoids your power cable from adding to the module depth
  • Protection
  • Reverse power protection
  • Buffered high impedance inputs
  • Output is protected by a 1K output resistor

Power consumption
  • +12V : 100mA max
  • -12V : 100mA max

Demo videos

Audio demo
Graciously recorded by Mr. Steve O'Hear

More can be found here :

If no cataclysmic events occur, I hope to release a batch of 10 units half December, price TBA

More info on

Please feel free to ask any question either here or over e-mail.

Thanks for the mention, Tom. I can confirm it is a great little filter (I bought the first one).

- Steve
That modulation matrix is a great idea, well done sir!

I generally like what you have done here, will be watching this space.
Tonescape wrote:
That modulation matrix is a great idea, well done sir!

I generally like what you have done here, will be watching this space.


So, maybe you've seen it on my website already, but here's a block schematic of the module, showing the possibilities that the modulation matrix has to offer nanners cool .

seems nice !
Paranormal Patroler
I like the design, the looks, and your general aesthetics. Nicely done!
Hi guys, thanks for the kind comments!

Check out the last awesome demo video for Steve's MS-22. In this video I'm showing what you can expect from the MS-22's resonance. Have a listen to the awesomely complex duophonic drones and pings in this video, demonstrating the MS-22's undeniable versatility! smile

This video is the last one before the MS-22's release, approximately a week from now. There will be a batch of 10 units available, price to be announced upon release.

Cool. Keeping an eye on this.
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