QUESTIONS? Call Our Gear Experts | 484-291-4327

ALM Busy Circuits Beasts Chalkboard: Dual octave switch and multiple


Beast’s Chalkboard is dual channel stepped voltage source and adder for your eurorack modular synthesizer system. It can also function as a dual precision buffered mult. 

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.


  • 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.
  • An ALM Classic.

Technical Specifications

Supply: +12V ~25mA / -12V ~25mA

Size: 6HP

Depth: 22mm (including power header)

Offset Error: +/- 10mV

        Brand: ALM Busy Circuits

        SKU: ALM-ALM002

        More Great Gear