I'm never without both, although I do quite a bit of work without hooking up the expression pedal. Unless I do a lot of foreground organ (mostly live band work), I'll generally do without the expression pedal in arranger play...

I wish I didn't have to, but I am already very busy with my feet running the arranger's sustain pedals (I always have separate UPR and LWR sustains) and doing all the Variation and Fill work that bouncing back and forth doesn't work well for me.

Not to mention I do quite a few gigs standing (I have always preferred doing this, despite my knees getting older!), and that's FAR to much tap dancing! BTW, that 'cacophony' only comes out when folk are too lazy to turn some of the Parts off and PLAY for themselves! You get in an over-busy live band, you have the same problem!

But recording, or live band work (where I don't have to run the arranger), I ALWAYS use one...