So, if I select "B-Mode 2.0ch" as my audio choice, & put "Dolby Surround" into the "Digital Audio" drop-down menu, it displays "EFM Tracks" as Dolby Surround, & doesn't show anything about the MUSE audio itself.

There need to be separate choices for "A-Mode + (Redbook) Digital Audio" & "B-Mode + Digital Audio", because some discs have the PCM option & some don't. And there needs to be a way to select at least Dolby Surround on B-Mode, because some discs have that. Now, why that should be when A-Mode 4-channel is available, I haven't the least idea ; but it's true.