Esoteric or CEC cd-transport

Congrats on getting the CEC transport! They have a very engaging, smooth and effortless sound. Since they're a belt drive design they may require some service over the years, but are much better sounding in my opinion as a transport compared to the Esoteric models.

I haven't seen that mod before either, but it appears to be an external clock input via BNC connector along with a switch to allow the selection of either the internal or external connected clock.

If you don't have an external clock connected I would assume that the switch should be set to "int" for the internal clock to be used.