@Roger - In response to your first post, I suppose pressing a TRIG repeatedly in this SONG MODE MUTE PAGE mode, would cycle between:
Normal (un-muted),
Muted,
Sound-locked (i.e the track sound parameter changes are muted, but note events still register),
Seq-locked ( per step trigs still active (!!))
and presumably the icons for each track would alter to reflect these 4 states as per my very crude scribbling below. (nb I renamed page from MUTE to TRACK PAGE - its still a single page)
Not sure how this would work from a FX perspective…
The midi tracks would of course just toggle between muted/unmuted in response to repeated TRIG presses in this context.