Esoteric or CEC cd-transport

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.

Mechans, it seems TEAC has already missed the boat with audiophiles moving to servers. They should have put VRDS Neo into more affordable players a long time ago.

The best guy for modifying CEC transports is lampizator.
Just read how he modified the CEC TL-1X transport.
Lampizator said the CEC TL-1X after his mods were the best transport he's ever heard and he's heard tons of transports and CD players.
http://www.lampizator.eu/lampizator/REFERENCES/CEC/CEC%20TL-1X.html -

Lampizator also modified CEC Dacs, but said the CEC Dac is not good. He said, there are much better Dacs out there.
Here's his commentary.
http://www.lampizator.eu/lampizator/REFERENCES/CEC_DAC/CEC%20DAC.html -

He does not mod anymore.