The core of Pittsburgh’s Dynamic Impulse Filter is a two pole lowpass using a Sallen-Key topology. Its tonal character is voluminous and smooth, high resonance values lead to aggressive sounding self-oscillation. As a second component, a VCA is included in the module. The user can decide via a switch, whether to use it as a filter or an amp. A third option is to employ both assembly groups in conjunction, forming the lowpass gate. It can be triggered using the impulse input. The reaction hardly differs from a vactrol-based circuit, the Dynamic Impulse Filter features natural, drum-like sound. The Decay can be adjusted using the dynamics response potentiometer. Depending on this knob’s setting, the module is able to create powerful kicks, toms, buchla-style bongos or short zap sounds. Thanks to a CV input plus attenuator, the parameter can be modulated to create steady variations. Combined with the self-oscillation, the Dynamic Impulse Filter is able to generate a broad range of drum sounds on its own. The response output allows the user to control external, vactrol-based circuits.
audio input and audio output
impulse trigger input, dynamics cv input, response output
3U Eurorack module, 8 HP wide, 20 mm deep
Current draw: 35 mA at +12 V and 35 mA at -12 V
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