Congrats on the MPP+ Elizabeth. It may not help you with organizing your SD cards, but I write the number, or whatever source system you have, on the MPP screen with the "annotation toolbar". That way you can bring up the music and immediately load your registration from SD
Bernie
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact