SEMSVF is a Eurorack tribute adaptation of the Oberheim SEM State Variable Filter in 12HP.  Each module being meticulously handmade in limited quantities, with a sound to die for and a look paying homage to an icon. 

SEMSVF is the king of 3080 OTA  filter designs.  A characteristic resonance feedback circuit and accept-no-substitutes obsolete NOS FETS at each stage yields an absolute creamy and silky filter response.  LP/HP and BP outputs.  A pair of signal inputs with mix pots.  That frequency MOD input with signal inverting.  That LP/HP/Notch mix sweep control that is CV modulated!  You’re welcome. 

FREQUENCY | the initial Cutoff Frequency of the filter

RESONANCE | the depth of the peak frequency resonant feedback.Res will not self-oscillate without an input signal present.

IN#1 & IN#2 | Mix together 2 different audio signals, each w/ their own mix pot.

MOD | Modulate the Cutoff Frequency w/ any polar/bi-polar signal.  At 12 o’clock, the pot has no modulation.  In the Counter-Clockwise direction it can invert the incoming control signal.

KB | Modulate the Cutoff Frequency w/ a V/oct signal or any other polar/bi-polar mod.  Self-oscillation resonance will track v/oct when KB is set to 100%.

NOTCH | Sweep the response from Lowpass, through Notch, to Highpass on the LP|HP Output.

LP|HP CV | Use external modulation to control the mix of the LP|HP|Notch.  The LP|HP CV knob amount is summed with the NOTCH knob (initial mix setting) above it.

LP|HP OUT | the audio output jack of the LP|HP|Notch filter tap.

BP OUT | the audio output jack of the BP filter tap.

Includes a 10-pin to 16-pin Eurorack ribbon connector. M2.5 or M3 (Doepfer standard) Phillips-head basic zinc rack screws are only provided on special request. Why do I do this? To cut down on rack screws that are wasted in the universe. What's it gotta be? Thousands? Hundreds of thousands? Unused, unwanted. You know the ones I mean | wrong size, wrong color, cheap junk tin, top slot-stripping, rack-rashers, wrong thread count, wrong length, wrong political party, etc. I use thumb screws in 2 sizes myself. So yeah, if you request some M3's from me, I will probably pull the ones from other companies boxes in my closet. You're welcome :D

12HP Module width
24 mm Module depth
26 mA on +12V
28 mA on -12V
0ma on 5V (not used)

The SEMSVF pairs well with:

GSE 101-VCO v2 3340 Oscillator, Delay like Happy Nerding FX Aid, LFO like XAOC Batumi, Sample-And-Hold like Pittsburgh Modular Toolbox

“Fresh squeezed, all natural and 100% juicy AF.” –Rick R.

“i love a good filter sweep with that resonance. so good!” –Dungeonmaster

“i'm convinced!” –Brett L.

“HOOOOOOOOLY SH#T, DUDE!! This filter sound INCREDIBLE!!” –Jay G.

ConditionBrand New (New)
Brand New items are sold by an authorized dealer or original builder and include all original packaging.learn more
Made In
  • United States

Reverb Protection

Simple Returns, Secure Transactions, Human Support

Learn more

Secure Checkout


Oklahoma City, OK, United States
Joined Reverb:2016

Reverb Gives

Your purchases help youth music programs get the gear they need to make music.

Carbon-Offset Shipping

Your purchases also help protect forests, including trees traditionally used to make instruments.

Oops, looks like you forgot something. Please check the fields highlighted in red.