Help Newbie PS3 Audio Question

[bpob]

Sorry for the newbie post. Just got the PS3 yesterday and hooked up to my plasma via HDMI. I also have an optical running to my receiver (Sony STR-DE597) as it is old and does not accept HDMI. The question is when I set the audio to optical, I cannot hear any sound coming from the TV speakers, I can only hear from the receiver. I do get sound from the TV when I set audio to HDMI, then I get nothing from the receiver. There are times when I will watch a BD without the receiver (late at night when the kids are asleep) and it seems odd that I have to keep switching the audio depending if I want to hear sound from the TV or receiver. I upgraded from the Sony BDP 300 and that unit had no problem doing both, it was just painfully slow.

I apologize in advance if this has been posted before or if it is not posted in the right thread. I'm just a newbie looking for help.