dåpf Dual All-Pass Filter

Instruo dåpf

Dåpf from Instruo is a dual all-pass filter offering two channels of phase-shifting fun to your Eurorack system. Rather than attenuating gain across the frequency spectrum, all-pass filters rotate the phase of a signal beyond a cutoff frequency, allowing for frequency dependent phase-shifting that serves as the basis for phaser effects and other stereophonic manipulations.

Cascaded input/output normalization makes it easy to patch one signal to both channels in parallel, while a global 1V/octave input lets you affect both channel cutoffs simultaneously. The left channel has switchable 1-pole or 2-pole operation, giving you further options for shaping your sound. As a core building block of multiple classic audio techniques, dåpf is a useful utility that's hard to find in Eurorack, and likely to bring new functionality to your patches.

dåpf Features

• Analog, dual-channel all-pass filter
• Useful for creating frequency-dependent phase effects such as classic phase-shifting and stereo enhancement
• Inputs have cascaded normalization for convenient patching
• Global 1V/octave tracking via CV input
• Attenuverters for each channel's CV input
• 1 or 2-pole options for left channel