If you can record the audio into an application like Cubase (or if you have a copy of the file in MP3 format) you could pitch it up and down as well as time stretch it to slow it down or speed it up as much as you want.

The one enclosed for instance, was imported it into Cubase, sliced into sections and a new pitch entered for each slice. The original file isn't altered, it's just Cubase telling the file to play at the new pitch.
If you want to do the whole song just click on the track and pitch it up or down. The changes are instant. (although time stretching is pretty processor intensive and takes awhile to render)

There's also an application called the Amazing Slow Downer (or something like that) but I haven't tried it.

The only tricky part is finding a way to convert the flash audio file to MP3 etc.. so Cubase will recognize it. Unfortunately, the Jam player is self contained and doesn't have a way to export the file. (that I know of)
I've been adding MP3's to lessons as well as Jam files, but I don't know if the other instructors are doing this too.