One more thing,

It appear that only firmware 3.0 and later allows the G to receive MIDI clock info. As long as your computer's MIDI-out is connected to the G's MIDI-in then
it should receive it.  There is no screen to configure it that way – it
just does it.

This is taken directly from the G-system forum:

http://forum.tcelectronic.com/topic/4226/midi-clock-for-tempo/

LA