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Edges

Quad chiptune audio generator

Enough with the analog, warm an organic. Edges is a module focused on the straight lines, sharp edges, and clinical harsh modulations of digital logic. Its architecture is loosely based on classic 8-bit console soundchips, providing 4 simple voltage-controlled voices. Each voice consists of a digital oscillator with two pitch CV inputs and a coarse pitch knob, with a gate input allowing the voice to be turned on/off without the need for an external VCA. The 4 channels are sent to an onboard mixer – making Edges easy to use for chord generation or heavy drone synthesis applications.

The first 3 channels are square/pulse digital oscillators, generated by subdivisions of a 4 MHz clock. 5 preset duty cycles settings are available from 50% to 95%. In addition, channel 4’s CV input can be used as a PWM CV for channels 1 to 3, with a 120° dephasing between each channel.

Channel 2 can be hardsynced to channel 1. Channel 2 and 3 are also equipped with a XOR ring-modulator, blending their harmonics with those of Channel 1.

The fourth channel uses a 12-bit DAC without oversampling/reconstruction filter to generate low-fi waveforms at a 48kHz sample rate. The available waveforms are sine, triangle, NES triangle, and various flavors of pitched LSFR noise.

Advanced features:

  • Optional semitone quantizer on the pitch CV input.
  • Per-channel mini step sequencer (8 steps) – perfect for creating rapid fire arpeggios. When the sequencer is active, the GATE input works instead as a CLOCK input.
  • Auto-calibrate feature digitally scaling the 1 V/Oct CV input to compensate for inaccuracies in CV converters… or to be used creatively to achieve other tunings than 1 V/Oct.

Tech Specification:

  • Units manufactured before september 2015 require a 5V voltage source (for example Mutable Instruments Volts).
  • All inputs: 100k impedance, DC to 2 kHz.
  • Channel 1 to 3: 4MHz, 1-bit.
  • Channel 4: 48kHz, 12-bit.
  • Open-source hardware and firmware.
  • 20-HP.
  • Current consumption: +12V: 70mA ; -12V: 20mA.

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