Well, is not just a little thing when you have diferent tempos, I did Peter and the Wolf (the whole Symphonic score ) 609 measures, with a lot of tempo, signature, etc. changes.....so, save yourself a LOT of time, my advise is to do it in a PC, in some (I use Cakewalk/Sonar), you can even draw the tempo, VERY easy with the software.

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mdorantes