Flow 3

An auto-dynamic filter in 6 HP: a state variable filter with simultaneous lowpass, bandpass and highpass outputs, whose core integrators saturate for a clean yet distinctive sound. The resonance rises smoothly into self-oscillation, and with temperature compensation and calibrated tracking the filter becomes a quadrature sine oscillator. A combined decay generator and envelope follower modulates the filter frequency over an adjustable range, from external triggers or, in auto mode, from the input's own amplitude envelope; the LED on the decay slider shows the envelope. Kick drums come easily, and at minimum resonance the Linkwitz-Riley response splits the audio spectrum into low and high bands for dual-band processing.