[Driver] Make the per-channel volume control more consistent.[Decoders] Downmixing support without surround decoders. Send center to the front left/right if there is no center speaker; send LFE to the front if there is no subwoofer.
[Control Panel] Fix random muting problem (only seemed to manifest on 10.1.5).
[Control Panel] Use CoreAudio format, not nominal sample rate, which doesn't work on 10.1.5.
[Control Panel] SRS Dialog Clarity and SRS TruBass require a surround sound decoder to be enabled, so change the UI accordingly.
[Control Panel] Allow the “QuickSwitch sets” bar to be hidden via the toolbar button in the window title bar. [N.B. The animation during show/hide is not currently very smooth.]
[Control Panel] Workaround for audio glitch at launch time. Audio now briefly mutes during launch.
[Device Helper] Workaround for bug in System Preferences: at the first startup after the software is installed/upgraded, delete the system prefpanes cache to force the System Preferences to notice our new pref pane.
If you encounter any issues after installing the driver update, please report them in the IMG forum thread linked below. The M-Audio team is constantly monitoring it for feedback on their product. IMG will have an in-depth review of the Revolution 7.1 in the near future.