Is it possible to configure (say) faders 1 to 10 which carry subs 1-10 with recorded fade times and using Bump as the "Go" button so that if I bring in (say) fader 4 this way then any other active fader between 1 and 10 automatically goes down to

if those subs controls the same channels/ parameters, you could use the setting release when stomped.

If not not you could use macros. So sub 1 execute macro 1. Macro 1 does release subs 2-10 and so on.

I would do macro's as well. Make sure to set the subs dwell time to HOLD. Then you should also not release the sub, but bump the sub once more to make sure it fades down at the programmed time.

I would do macro's as well. Make sure to set the subs dwell time to HOLD. Then you should also not release the sub, but bump the sub once more to make sure it fades down at the programmed time.