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ALM Busy Circuits Beast's Chalkboard Octave Switch

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ALM Busy Circuits Beast's Chalkboard

‘Beast’s Chalkboard’ is dual channel stepped voltage source and adder for your Eurorack modular synthesizer system. It primarily is intended as a dual octave switcher for VCO’s but has many other uses including sequence transposition, FM ratio creation, buffered CV distribution and VCO calibration.

Beast's Chalkboard Features

  • Dual channel voltage adder and source with 1V stepped range of -2 to +2 volts (i.e 5 Octaves)
  • Two Buffered outputs and through output per channel
  • Top input normalized to bottom. Allows input to be varied across both channel outputs
  • Bottom octave switcher can be chained to top extending range to 9 octaves
  • Also functions as 1->6 or dual 1->3 buffered mult
  • Skiff friendly
  • Designed and built in England


  • Eurorack Module
  • 6 HP Width
  • 22mm Depth (including power header)
  • Supply: +/-12V (Reverse voltage & polyfuse protection)
  • Current Draw: ~30ma
  • Offset Error:  +/- 10mV
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