Cowboy Callosum: Two Double Knot Cowboy panels (hand cut graphics) around a Callosum section.

Cowboy 2/12

For sale at Control in Brooklyn

Cowboy 1/12


The callosum is set of circuits for mixing the two brain halves on either side of it. After desinging it initially to be placed between two double knots I realized that any sort of source doubled and mirrored around this piece could make a brain-formatted synthesizer. Above is a digital painting block diagram of the collection of circuits. These circuits arranged to be a mixer of sorts, not just mixers of signals by addition but mixers by modulation. The ring modulator does this by amplitude modulation, and the filter by frequency-content modulation. This particular ring mod topology of just a single lm13700 OTA was picked for its slightly lop-sided character. The binaural crossover design is a fairly vanilla state variable filter based mostly on reading Don Lancaster's Active Filter Cookbook.

  • Binaural crossover is a state variable filter that has 3.5mm outputs that give high pass in one ear and lowpass in the other.
  • Two ringmods are simple types that have AC and DC inputs for both X and Y.
  • Mix signals of all frequencies in stereo.
  • Ring filter resonances with sharp signals
  • Ring mod two smooth tones together