Overview
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Manual
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Quad Creek is a semi-modular analog sound generator and effects unit featuring four voltage-controlled band-pass filters and a variety of CV circuitry. The multi-purpose nature of the band passes allows for a variety of functions, including melodic drones, plucky percussion, wah-like audio effects, and more. Combined with a white noise module and dedicated CV circuitry, you can craft complex polyrhythmic percussive and melodic structures
The Quad Creek also features a 5 channel mixer, three stereo audio outputs, and two stereo audio inputs.
It will be available as a full unit, DIY kit, and PCBs later this year, and will be free hardware, with gerbers and schematics publicly available.
The Creeks are a marriage of a resonant band pass filter and pulse interpreter circuit that pings the filter.
Resonance: Adjust the decay of the filter when pinged by turning the purple knob. Turned fully clockwise it will oscillate.
Frequency: Set the filter's pitch using the blue knob, or connect a CV source to the top-left banana jack for modulation.
Tempo: Control the rate of pings over time with the green knob. Keep in mind it's dependent on gate inputs from the bottom-left banana jack.
Input gain: Use the black knob to manage the input gain for the stereo auxiliary input. For direct filtering, inject audio into the top-right banana jack; its signal is unaffected by the gain knob.
Additionally, the pulse interpreter outputs a riser to the bottom right banana jack, and there is an audio output at the top.
The Center Console is the bustling CV capitol of Quad Creek. It includes two CV step-sequencers, a white noise percussion generator, sine LFO, and two pulse generators.
LFO & Pulse Generators: At the bottom of the center console, you'll find the LFO and pulse generators, each with a purple knob to set their frequency.
In the middle is the sine LFO, which has a range between 0.1-12hz. Flanking the sine LFO is two pulse generators, which can be set between 4 and 120BPM.
White Noise Percussion: Centered above the LFO and Pulse Generators, you'll find two adjacent banana jacks - these are the CV inputs for the percussion. Patching two separate signals into these jacks allows for the creation of complex, syncopated patterns by allowing the two CV sources to intermingle, creating unique and dynamic rhythms.
Sequencers: The green knobs set the CV level for each step of the five step sequencer, while the blue knobs do the same for the three step. The outputs of the sequencers are the bottom left and right banana jacks.
Their clock inputs are above the output, and adjacent to each clock input is the "flip" input, which changes the direction of the sequencer upon gate input.
The layout pictured in this diagram is horizontally mirrored for the three step sequencer.
