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The module takes a standard (typically simple) input waveform at audio or low frequency, calculates the frequency of the input using selectable zero-crossing, positive or negative polarity sensing.

The frequency information is then output in multiple forms:

  • 1V/OCT for use with oscillators and other audio modules, with options for 0V being C0, C1 (default) or C2;
  • Frequency with options for 1V=10Hz, 1V=100Hz or 1V=1kHz for modules which support this;
  • BPM CV using the Andrew Macaulay Modules standard 1V=100bpm, useful to sync LFO inputs or gates with low frequency sources; and
  • WaveTime CV at 10ms/V, 100ms/V or 1sec/V allowing control of audio slew rates on the Slew Processor or envelope times on the Voltage-Controlled Envelope.

The WaveTime CV also has settings for full cycle, half-cycle or quarter-cycle timing and divide by 2 using the same options as the Pitch CV to Wavetime module.

Due to the internal sample rate and the measurement approach, frequency measurement works up to around 21kHz and there is some very small amount of drift in the measured values (which can be more noticable at higher frequencies), which can be reduced by the included optional smoothing of up to 10ms on the frequency measurement.

Annotated image of Frequency to CV module with description of controls
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