I've pretty much figured out the interface except for one thing: how do you change the tempo of the song you are tabbing at a certain point into the song instead of at the beginning? The song I'm doing now has three different speeds to it but when I try to change the tempo the only one I can get is from beginning to end.

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You use the Mix Table(F10) which you can change tempo, instruments, volume, etc.. The icon for it is a gray rectangle with a green box on the left and dark red on the right.
I use guitar pro 5[RSE] first it was MIDI format when i press RSE it sounds good like a original guitar,bass,drums,piano.