Problem with Tascam Bass Trainer

I just recieved the Tascam Bass trainer (MP3 version) and I cannot figure out how to change the key of only one single song within a playlist.

All I can do is change the key of every song in a playlist.

I could do that with the pacemaker plugin for winamp, and I hoped I could do this with the Bass Trainer just the same.

If it is not possible to have this done with a single file within a playlist, can anyone tell me how to record a MP3 with a different key, as modified by Pacemaker ?

Thanks.