As long as you associate the BDP audio output with the 990 input you should be able to run an HDMI cable from the BDP to the projector and either of the digital audio signals or the analog outputs to the 990. When watching a movie the audio would come through the 990 digital processing and the video through the BDP to the projector. I think if you want the newer codecs you will have to have the BDP process them to the 990 through the analog channels.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner