I understand you were in the Music Settings. In those settings, the Super Audio CD Playback Layer should be set to Super Audio CD. Below it, the Super Audio CD Playback Channel should be set to DSD Multi. Now, back out of the Music Settings and into the Setup menu and select Audio Settings. The DSD Output Mode may be set to Off. If so, change it to Auto. These settings should enable 5.1 playback of a SACD if it contains a multi channel track. To check the signal while playing the disc, press the RECEIVER button on the Onkyo remote control. Then , press the HOME button. From the list of items, select INFO to see the audio and video codecs at play. BE AWARE: Changes to the audio settings will not take effect unless the disc is ejected and then reinserted into the player.