Audio/music speed ramping tool?

I was hoping somebody could point me in the direction of a good (hopefully free) audio mixing/editing tool to ramp the speed of a track.

I am looking to take one music track (uptempo) have it play a few seconds, then ramp the speed down to blend with another track, cross-fading it out so that only track 2 can be heard.

I am a Video Editor and am trying to incorporate this cool audio effect in my project with 2 tracks I have chosen. I have the Adobe Master Collection, but Audition can't do this (nor can Premiere or After Effects, even though they can do it with video).

I am hoping for a free solution, but will definitely take all suggestions (the easier the better) for how to accomplish this.

Thanks to anyone that can help.
Aza