The ES-6 is the counterpart to the ES-3 Lightpipe/CV Interface and ES-8, offering up to 8 channels of CV input with output via an optical lightpipe connection. As with the ES-3 and ES-8, the ES-6 also works well for audio signals, with conversion quality on a par with a regular audio interface.

The ES-6 itself has 6 input sockets; the remaining 2 channels are provided by an expansion module e.g. the ES-7.

Please note that a connected ES-3 or ES-8 is required for operation. The ES-6 gets its clock signals from the ES-3 or ES-8, which derives them from its lightpipe input.

The ES-6 mk3 is functionally equivalent to the ES-6 mk2, but the design has been slightly updated to improve the module's resistance to electrostatic discharge damage and to ensure that it can be produced with currently available components.