This is also on my own list… which is quite huge 
This is a programmable midi relay that I use to control switch my Leslie and other switched switched items in my rig, works flawlessly.
This may be of interest, LED Key Zones or What Happens When You Are Bored
I used the M-Audio Oxygen 61 and the Pro version.
Inexpensive, decent keybed, (although the Pro has a much better feel) plenty of controls/pads/sliders
I’ve never had an issue with them.