[LAU] Playing with play-a-long tracks?

Hi all, I have some play-a-long tracks from Jamey Aebersold that I would like to use for practice. They are setup so that bass and drums are on the L channel, and piano and drums are on the R. Since I play piano, I need only the L channel. Is there any way to "extract" only the L channel out of the recordings? Once that is done, can something be done to the result that would cause it to sound in both R and L channels, like a true mono recording perhaps? I can easily turn the pan control on my mixer fully left, but that leaves a big hole in the right side. I hope this makes sense, if not please let me know. Thank you! Josh -- Josh Lawrence