Mute will remain half lit if some tracks are muted (or soloed).
From page 15 of the manual:
The tracks you have muted in this mode stay muted even if the pattern is changed or a new kit is loaded. After exiting MUTE mode, the LED light atop the [MUTE] key will stay lit, half-bright red, if any of the tracks are muted. The MUTE mode is a part of the active state of the machine. It is not stored to the current kit or pattern. Mutes activated in MUTE mode are the master mutes, and they will override any TRIG MUTE patterns on the sequencer or any SONG MUTE program on any pattern of the active song.
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