make-noise/qpas
QPAS
Quad Peak Animation System — a stereo multimode filter using four state-variable filter cores with Low Pass, High Pass, Band Pass, and Smile Pass outputs simultaneously available, stereo Radiate controls for peak animation, a pre-filter stereo exponential VCA, and !!¡¡ modulation inputs.838
Visualization filter_response
Capabilities 5
- Multiband Filtermultiband-filter
- Twin SVFs expose LP, BP, HP, and Smile outputs simultaneously on separate jacks; stereo dual-core.838
- Self-Oscillationself-oscillation
- Twin-peak SVF; each core self-oscillates independently and the module is a signature pinging filter.838
- Stereo Filterstereo-filter
- Four state-variable filter cores simultaneously providing LP, HP, BP, and Smile Pass stereo output pairs. All four cores share a single FREQ and Q control; Radiate-L and Radiate-R independently spread the left and right peak pairs for stereo animation.838
- Vcfvcf
- Voltage-controlled stereo twin-peak quad-core SVF.838
- Voltage-Controlled Amplifiervca
- 838
Jacks 17 (9 in / 8 out)
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (9) | |||
| !!¡¡ Input L | mixed | — | 838 |
| !!¡¡ Input R | mixed | — | 838 |
| Freq 1 Input | cv | — | CV input controlling cutoff frequency. Can accept audio-rate signals for FM. Freq 1 input attenuator is mentioned alongside Radiate-R for fine control.838 |
| Left Input | audio | — | Left audio input. Normalled so that patching only the left input sends the same signal to all four filter cores, enabling mono-to-stereo operation.838 |
| Level CV Input | cv | — | CV input for the pre-filter exponential VCA level control.838 |
| Q CV Input | cv | — | 838 |
| Radiate-L CV Input | cv | — | CV input for Radiate-L. Normalled to Radiate-R CV Input so patching here modulates both Radiate controls.838 |
| Radiate-R CV Input | cv | — | CV input for Radiate-R. Normalled to Radiate-L CV Input.838 |
| Right Input | audio | — | 838 |
| Outputs (8) | |||
| BP Left Out | audio | — | 838 |
| BP Right Out | audio | — | 838 |
| HP Left Out | audio | — | 838 |
| HP Right Out | audio | — | 838 |
| LP Left Out | audio | — | Left Low Pass filter output. Contains all four peaks when only this output is patched (Right LP normalled to Left LP).838 |
| LP Right Out | audio | — | Right Low Pass filter output. Normalled to LP Left Output; when unpatched, all four peaks appear in the left output.838 |
| SP Left Out | audio | — | Left Smile Pass output. Topology changes with cutoff frequency to maintain relatively constant output amplitude. Not normalled to right output to avoid phase cancellation.838 |
| SP Right Out | audio | — | Right Smile Pass output. Topology changes with cutoff frequency to maintain relatively constant output amplitude. Not normalled to left output to avoid phase cancellation.838 |
Parameters 8
| Name | Type | Range | Behavior |
|---|---|---|---|
| Frequency | knob | — | Sets the base cutoff frequency shared by all four filter cores simultaneously. Has a large knob due to the dramatic effect of modulating this macro parameter across all cores.838 |
| Level Combo Pot | knob | — | Controls the level of the incoming signal through the pre-filter exponential VCA. When Level CV Input is patched, acts as an attenuator for that CV. Also used to set input drive level relative to Q/resonance.838 |
| Q | knob | — | Controls resonance for all four filter cores simultaneously. Around 9:00, achieves 'zero' resonance. Fully counterclockwise gives 'negative resonance' (peaks attenuated). Higher settings create prominent peaks; at very high settings, filters can be excited into ringing by input signals.838 |
| Q CV Input Attenuverter | knob | — | Sets depth and polarity of CV modulation at the Q CV input.838 |
| Radiate-L | knob | — | Spreads the two left-channel filter peaks relative to the main FREQ setting, creating stereo image offset and peak animation in the left channel pair.838 |
| Radiate-L CV Input Attenuverter | knob | — | Sets the depth and polarity of CV modulation at the Radiate-L CV input.838 |
| Radiate-R | knob | — | Spreads the two right-channel filter peaks relative to the main FREQ setting, creating stereo image offset and peak animation in the right channel pair.838 |
| Radiate-R CV Input Attenuverter | knob | — | Sets the depth and polarity of CV modulation at the Radiate-R CV input.838 |
Firmware history 0 versions
No firmware history recorded.
References 2
- [838]
- [839]