The cheapest easiest way would to buy a BNC/RCA cable and go from the BDP-2 to your pre-amp or amp,
If you have a pre-amp or amp.
The cable is cheap and available here $19.00 for a 6 foot.
http://www.bluejeanscable.com/store/digital-audio/index.htmI have the oppo 103 and have plugged in a USB drive, and played flac files.
The 103 was using the HDMI output into to my pre/amp. It's ok, but not as good as
the BDP-2 - bnc/rca into my pre-amp.
If you do not have a pre-amp or amp,
when the BDP-2 firmware allows you to output on USB,
you
MAY be able to go USB from the BDP-2 to the oppo USB input, then out to ?
I would not use it in this scenario.