As others said, if you hit simu, you'll be entering simulation modes and 5ch stereo is as the others mentioned. If you want to listen to 2ch music in surround, you should hit the music button. By keeping on pressing, you'll be alternating between PLIIx and NEO6, pick whichever sounds more natural to you (I usually prefer PLIIx)

Bruno
M80s/VP180/QS8s/EP600/AVR-890
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"The problem is choice..."