I was wondering if you used Melodyne (a pitch shifting/pitch correction feature found in some current recording software apps) and then filtered out the individual parts of the original stereo .wav file. You could then reassemble another .wav file out of these individual tracks. The Ketron SD-7 may have a new technology to read a multitrack .wav file. I have no experience with or knew that a multi-track .wav file existed.

All I know about this is I am certainly going to investigate this new feature when I get my new Ketron SD-7 from AJ as soon as they arrive here in the US.