If you have a Roland (especially the G70/E80).........

GET THE FC-7 FOOTPEDAL!!

Totally hands free selection of Variation, plus whatever else you feel like (within limits).

My choices are

1-4 Variation select (also triggers fill if Auto-Fill is on)
5-6 Lower and Upper Sustains (can span both easily with one foot if needed)
7 Leslie Fast/Slow

Now I rarely need to take my hands off the key-bed while I'm performing.........

But many other combinations are possible.