Reply to The right software for recording a promo mix?!

Hey Guys

I am looking for a software package to create some promotion mixes. I don't like using Traktor for recording those mixes, because as you probably guys know, making 1 failure means starting all over again. I have tried Ableton and Sound Studio for mac. The problem with those two packages is, you can only use 1 BPM speed for the whole mix.
What i am looking for is a software package which allows me to build up the bpm of the set slowly. So for example: I want to start the mix with a 118 BPM track, build up the tempo and end it with a 130 bpm track. I have been looking for Sony Acid Pro, but i can't find out if this program also uses 1 steady bpm for recording mixes..?

I hope you guys can help me out..