So Mo, what you're saying is, you can play in more keys, but just not comfortably. So if the bridge mods to a different key, you aren't hitting the transpose button in order to play the bridge in C in the middle of the tune, and then hit the transpose button again so you can play in C over the release. So if you're playing Sentimental mood in F, you'll transpose so you can play it in C, but over the bridge you will play in A flat? Or will you also use the transpose in the middle of the tune to get you into the bridge key and back out? If so, how on earth do you do that smoothly and get all the transition chords?