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Instruo Dapf User Manual

Dual all-pass filter
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dåpf
Dual All-Pass Filter
User Manual

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Summary of Contents for Instruo Dapf

  • Page 1 dåpf Dual All-Pass Filter User Manual...
  • Page 2 Contents Description / Features Installation / Specifications Overview Channel 1 Channel 2 Global Normalling Patch Examples: Mono Phase-Shifting Serial Mono Phase-Shifting Mono to Stereo Phase-Shifting Stereo Phase-Shifting...
  • Page 3 Description 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.

  • Page 4: Installation

    Installation 1. Confirm that the Eurorack synthesizer system is powered off. 2. Locate 4 HP of space in your Eurorack synthesizer case. 3. Connect the 10 pin side of the IDC power cable to the 2x5 pin header on the back of the module, confirming that the red stripe on the power cable is connected to -12V.
  • Page 5 dåpf | da:/f | (acronym) Dual All-pass Filter 360º φ – 0º – 12dB 1V/OCT dåpf 1. Channel 1 Input 8. Channel 2 Output 2. Channel 1 Output 9. Channel 2 Phase Slider 3. Pole Toggle 10. Channel 2 Phase CV Input 4.
  • Page 6 Channel 1 Input (IN): The channel 1 Input (left) provides direct access to the channel 1 all-pass filter. Output (OUT): The channel 1 Output (left) provides the filtered signal present at the channel 1 Input. • If no cable is connected to the channel 1 Output, then the signal present at the channel 1 Input is processed and passed to the channel 2 Output.
  • Page 7 Channel 2 Input (IN): The channel 2 Input (right) provides direct access to the second all-pass filter. • If no cable is connected to the channel 1 Input, the signal present at the channel 2 Input normals to both all-pass filter channels. In this scenario, only the corresponding phase parameter will affect the signal present at the respective channel Output.
  • Page 8 Global 1V/Oct Input: 1V/Oct Input is a bipolar control voltage input that is calibrated for 1 volt per octave tracking. • Control voltage is summed with the values set by the Phase Sliders Phase CV Inputs. Normalling The normalling of input signals moves clockwise around the panel from Input to the channel 2 Output.

  • Page 9: Patch Examples

    Patch Examples Mono Phase-Shifting: Summary: Input An oscillator is connected to channel 1’s monitored through channel 1’s Output. A control voltage signal modulates the phase. Output (sine) – Audio Path: • Connect the output of a harmonically rich oscillator waveform to the channel 1 Input.
  • Page 10 Serial Mono Phase-Shifting: Summary: An oscillator is attenuated and then connected to channel Input and monitored through channel 2’s Output, creating a mono 2’s sum of both channels. Two different control voltage signals modulate the phase of each channel. Output (triangle) –...
  • Page 11 Control Path: • Connect two different control voltage signals to both Phase CV Inputs and set the corresponding Phase CV Attenuverters to a desired position. Note: If using bipolar control voltage signals, bias the corresponding Phase Sliders so that negative voltage doesn’t clip the Phase CV Inputs.
  • Page 12 Mono-to-Stereo Phase-Shifting: Summary: Input An oscillator is connected to channel 2’s monitored through both Outputs. Two different control voltage signals modulate the phase of each channel. Output (right) Output (left) (triangle) – (sine) Audio Path: • Connect the output of a harmonically rich oscillator waveform to the channel 2 Input.
  • Page 13 Control Path: • Connect two different control voltage signals to both Phase CV Inputs and set the corresponding Phase CV Attenuverters to a desired position. Note: If using bipolar control voltage signals, bias the corresponding Phase Sliders so that negative voltage doesn’t clip the Phase CV Inputs.
  • Page 14 Stereo Phase-Shifting: Summary: Two oscillators are connected to both Inputs and monitored through both Outputs. Two different control voltage signals modulate the phase of each channel. Output (right) Output (left) (triangle) – (sine) Audio Path: • Connect the outputs of two harmonically rich oscillator waveforms to both Inputs.
  • Page 15 Control Path: • Connect two different control voltage signals to both Phase CV Inputs and set the corresponding Phase CV Attenuverters to a desired position. Note: If using bipolar control voltage signals, bias the corresponding Phase Sliders so that negative voltage doesn’t clip the Phase CV Inputs.