15 HP
50 mm deep
Current Draw
120 mA +12V
40 mA -12V
0 mA 5V
$395 Price in €

This Module is discontinued.

HM1991: Wavetable oscillator

Wavetable oscillator with variable interpolation resolution. Two ROMs are onboard, each containing 256 waveforms in 16 banks. Waves may be smoothly morphed or violently jumped in two dimensions. It's up to you. The degree of discontinuity these waveform changes is voltage controllable.

Instead of using the internal Piston for waveform lookup, why not plug in an external oscillator or anything else? You can also use a gate input to instantly toggle between ROM chips.

Optional Daughterboard

An optional expansion board provides six more ROM sockets for use with Blacet/Wiard-format waveform data. Use wave256 software to write your own data. Slots for 6x serial EEPROM. Miniwave/Waveform City format data.


  • 2 ROM slots standard, 256 waves each (16 waves per bank)
  • Interpolation discontinuity modulation
  • Voltage-controlled waveform selection
  • External oscillator input
  • ROM select facility
  • Dedicated square wave output
  • Hard digital synchronization input

Ø 4.39 (36 Votes) Average Rating
submitted Oct 13th 2012, 19:33 by the83 | last Change Mar 27th 2023, 08:23 by ParanormalPatroler

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