Stylophone CPM DF-8 Analog Dynamic Multi-Filter

The Stylophone CPM DF-8 is an analog dynamics processor and multimode filter designed to reshape incoming audio with voltage-controlled filter topologies and envelope-following circuitry. Built around discrete analog components, this compact desktop unit accepts line-level or instrument signals and applies time-variant filtering determined by the amplitude envelope of the input source. The result is a responsive tool for rhythmic filter sweeps, percussive tonal shaping, and frequency-dependent dynamics control that reacts in real time to playing dynamics.

Eight filter modes span low-pass, high-pass, band-pass, and notch configurations, each with continuously variable resonance control that reaches self-oscillation at higher settings. The envelope follower circuit tracks input amplitude and modulates the filter cutoff frequency, with dedicated attack and decay controls ranging from 1ms to 1 second per stage. Threshold and depth parameters determine how much signal amplitude translates into filter movement. Quarter-inch jack inputs and outputs handle instrument and line-level sources, while an auxiliary input allows external audio to trigger the envelope circuit independently of the main signal path.

Features

• Eight analog filter modes including low-pass, high-pass, band-pass and notch
• Envelope follower with 1ms to 1 second attack and decay ranges
• Resonance control from subtle emphasis to full self-oscillation
• Independent threshold and depth controls for envelope modulation sensitivity
• Auxiliary input for external envelope triggering from secondary audio source
• Quarter-inch jack input and output connections for instrument and line signals
• Discrete analog circuitry throughout signal path and filter stages
• Compact desktop form factor with knob-per-function front panel layout