The ES-5 piggybacks on one of the ES-3's stereo channels to provide eight gate/clock/sync/MIDI outputs on the ES-5 itself. Furthermore you have further expansion headers to connect up to five ES-4 gate expanders. This means you can add 48 digital outputs to the ES-3!
The ES-5 is intended to be used with the latter versions of the ES-3 (Mk2 and Mk3) as the first version has no expansions headers which means you would have to solder.
8x 3,5mm outputs on front panel.
internal: Five headers for installing up to five ES-4s
3U Eurorack module, 4HP wide, 49mm deep
Current draw: 8mA@+12V and 0mA@-12V