I connected my Apple TV via optical directly to an optical input on the G68 and took the HDMI direct to an input on the KuroTV.

The Apple TV cannot decode DD nor output discrete 5.1 over HDMI (unless I am much mistaken) so there is no point going via the HD621 unless you are also using it as an input selector switch for your projector.

Setting up a new input on the G68 can be done from the front panel, just RTFM . Unless you have an odd setup, the speakers will likely not need to be configured unless the input you use on the G68 had been previously set up for the D2 input on the speakers or you really want a relevant display code. Mine is set to PC just to be ironic smile

"Wonderful perfect quadraphonic sound with distortion levels so low as to make a brave man weep" - Prostetnic Vogon Jeltz of the Galactic Hyperspace Planning Council