I bought a MIDI changer (Gecko MKII One Control) with the intention of using it for quick changes. Truth be told, I haven’t really been using it. I organized my sounds across the banks- instead of chronological order in a single bank. If I’m switching between two sounds, I put the first patch in Bank 2 and the second patch in Bank 1 (on the same number). That way, even a sloppy counter-clockwise turn of the bank knob will get me there with no problem. If I have three changes in a song, I usually have more time between one of the changes than the other, and I always keep the quicker change going to bank 1. (Of course, whenever possible, I use splits to avoid changes, which is one of the big advantages of a 16 voice Rev2.)