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Gate, clock and sync expander for the ES-3 The ES-5 is an expansion module for the Expert Sleepers ES-3 Lightpipe/CV Interface. It piggybacks on one of the ES-3's stereo channels to provide eight gate/clock/sync/MIDI outputs on the ES-5 itself, plus further expansion headers to connect up to six expansion modules e.g. the ES-4 Gate Expander.