Re:Changing the tempo for an entire song....
I am not very experienced with audio snap, and from the various videos and my own attempts to do it on a track by track basis, I have foudn the process within SONAR to be tedious and computer intensive. I bought Samplitude Red Roaster a long time ago to be my CD Mastering softare and have upgraded through version 8. I will mix down my SOnar project and change tempo within Samplitude. It is foolproof (yes even for me), immediate, and by my ear, artifact-free.
A process can not be understood by stopping it. One must flow with it and become one.
SONAR Platinum x64, WIN 7 Pro x64, i5-2500K, z68 mobo, 8 Gb RAM, Roland Quad-Capture, 2 SSds, 3 SATA HDDs