Open the song with jinbo, look at the top "effect" and select "time warp".

After coming out of the interface, to select FFT, select "Change" at the top, and slide left and right to the appropriate percentage.

The greater the percentage, the greater the speed and the slower the speed, and 100% is the demarcation point. You can click on the green triangle audition below. Apply after you are satisfied. Note that after changing the percentage, you must re-audition before you can work.