I was playing around the with FX track on my A4mk2 last night and spotted that the FX track has the same ENV toggles on the Note page as the other tracks, but the FX track has no envelope.
So what do these do?
(screenshot from the manual, showing T4, not the FX track, but just to illustrate which controls I’m referring to)
My guess is that it’s there to maintain all values when copy-pasting to/from any track…?
Note # is also p-lockable on FX tracks, despite the lack of fx keytracking
That Note P-Lock might have to do with the LFO Multiplier set to Note (Tuning fork)
Post correction edit: Derp. Thanks folks ^^
There’s no tuning fork multipliers in FX track 
That’s availble only for T1-4 iirc