A µP controllable dynamic signal processor from Curtis ElectroMusic Specialities.

from the original data sheet

  • complete system on a chip: a 4-pole VCF, five VCAs and a wide range ADSR
  • few external components
  • 0 to +4.5V, high Z control inputs for direct interface to CMOS multiplexer from DAC
  • constant volume vs. resonance VCF characteristic
  • open loop VCF design for rich sound
  • temperature compensated VCF transconductors
  • low noise, low IM distortion VCA
  • low VCA feedthrough without trimming
  • variable ADSR amount into VCF with either DC or AC coupling
  • true RC (exponential) ADSR shape
  • separate envelopes for VCA and VCF possible
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