Instruodåpf Dual All-Pass Filter
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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
- Eurorack module
- Width: 4hp
- Depth: 30mm
- Current draw: 60mA @ +12V, 60mA @ -12V
The first few examples are much quicker, more practical examples of dåpf patched.
Thanks for watching :)
~Jason
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Introducing dåpf, the first dedicated effects processor in the Instruō product line. The Instruō dåpf is a set of two analogue all-pass filters.
You might be asking yourself, “What is the point of a filter that passes everything?” All-pass filters don’t actually attenuate frequency amplitudes directly, but rather alter the phase relationship of frequencies across the spectrum. All-pass filter stages appear in the vast majority of voltage-controlled filter topologies as well as serving as a core building block within DSP.
The normalled I/O of dåpf allows for cascaded or independent use of the two all-pass filter circuits, offering everything from classic phase-shifting to psychoacoustic stereo enhancement and synthetic Doppler effect.
• Two parallel all-pass filters
• Independent attenuverters for voltage control
• 1-Pole/2-Pole configuration for left channel
• Cascaded normalisation
• Global 1 volt per octave tracking
I'm always striving to learn and explore with sound and music and dapf (the new Eurorack module from Instruo) certainly brought a big slap of school day into DivKid HQ. I was aware of all pass filters, getting past the funny idea that "all" frequencies pass (so what's the point?) and knowing they were use for phase shifts. What I didn't know is how core and important to filter topologies they were and how creatively useful they could be.
Some exploring later and here we are, with 3 patches that really show the power of phase manipulation. While dapf makes a fantastically chewy phaser FX unit I didn't expect it would be such a great stereo expander for a single VCO nor did I know I could be MUSICAL and totally analogue 3 operator FM/PM (like the digital Yamaha DX and Casio CZ phase/FM methods) synth.