In this video, via sonicstate, Nick Batt takes a look at the Studio Electronics Boomstar SEM Filter for Eurorack modular synths. 

The Boomstar SEM Filter is inspired by the filter of the classic Tom Oberheim Synthesizer Expander Module (SEM). 

Studio Electronics notes that it has an ‘easy bonking’ design.

“The beauty of this feature,” notes SE’s Greg St. Regis, “is that you benefit from all the loveliness of a traditional SEM filter by keeping the input and resonance level short of maximum, and have the power to twist the once boxy, gentle circuits into a demented, distorted, peaking and vanishing, snarlingly wild beastly sound. Full variety is what we have provided.”

Controls & Patch Points:

• FREQUENCY – Adjusts the frequency, or cut-off of the filter.
• RESONANCE – Adjusts the resonance of the filter.
• FULL HALF TRACK – Switch between full and half keyboard/voltage tracking.
• FREQ CV 1 – Frequency control voltage 1 input attenuverter.
• RESO CV – Resonance control voltage input attenuverter.
• LP HP – Low Pass / High Pass attenuverter.
• INPUT – Adjusts the audio input.
• OUTPUT – Adjusts the audio output.
• 1 V/O – One volt per octave control voltage input.
• FREQ CV 1 – Frequency control voltage 1 input.
• BP OUT – Band Pass Output. No cable patched, BP passes through the mains.
• RESO CV – Resonance control voltage input.
• INPUT – Audio input.
• BP LP-HP – Switch between Band Pass and Low Pass – High Pass modes.
• OUTPUT – Audio output.

The Boomstar SEM Filter is available for US $269.