The ES-4 is a Eurorack format module which converts a standard S/PDIF input to five channels of control voltage.
Two of the five channels are calibrated to provide over 5 octaves of 1V/octave pitch CV. The remaining three channels are general purpose outputs (for use as e.g. gates, envelopes, LFOs) and each have a nominal range of 0-10V or ﾱ5V (user selectable).
Since S/PDIF is a stereo-only format, the encoding of the five channels on to two is handled by software provided as part of Expert Sleepers Silent Way.
The ES-4 will connect to any audio device using the S/PDIF standard. This includes the digital audio output provided as standard on all recent Macs (more info here on the Mac connection).
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