A 4-pole resonant voltage controlled filter from Curtis ElectroMusic Specialities.

from the original data sheet

  • low cost
  • low external parts count
  • open loop design for enhanced sound richness
  • tight parameter spreads for minimal trimming
  • wide sweep range, low control feedthrough and low noise
  • temperature compensated transconductors
  • custom tailoring of volume vs. resonance
  • differential inputs
  • internal buffer
  • wide supply range
  • large output swings even at ±5V supply

    Synthesizers using the chip:
    with the amount used

    Crumar Bit 01 (late models)  6
    Ensoniq Mirage               8
    Oberheim Prommer             1
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