The Dave Smith Instruments DSM01 Curtis Filter Module is DSI's first foray into the world of Eurorack, offering the classic Curtis filter from their line of analog synthesizers. Along with controls for Cutoff Frequency, Resonance, 12 or 24 dB/oct Slope, and Boost, the DSM01 also features CV inputs for Cutoff Frequency, Resonance, and the voltage-controlled amplifier (VCA), an Audio In jack, and separate audio outputs for the filter and VCA. The DSM01 comes in an 8 HP width.