Accelerate/Decelerate playback by some ammount

Im trying to figure out how to accelerate/decelerate a track while its playing. Effectively I have a track 20 seconds long and I want to play it decelerating by 0.2seconds per second until it stops. How can I acheie this? I don’t know how to program.

Audacity has several ways to change the speed of a recording.
See these links:

I found out how.