I've read several threads here regarding Handbrake encodes and the Apple TV 3, but I am still confused regarding the audio track. The Apple TV 3 preset has two tracks. Track #1 is using the AAC Codec and DD Pro Logic II Mixdown; while Track #2 uses the AC3 Codec and either AC3 Passthru (AC3 Source) or 6-channel discrete (DTS Source) Mixdown. I have the ATV3 connected via HDMI to my Sony TV and connected to my Onkyo receiver via optical. My question is, how do I know whether my Onkyo AVR is automatically using audio Track 2? If it isn't automatic, can I manually set the ATV3 to output audio Track 2 via optical? Thanks.