Russ,
I had an SD1 and presently a Midjay and don't think that the stereo issue should be a problem for you. All the samples I have heard are mono or -if they are stereo- play fine in mono as well.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.