Hello,
I would make a few Folders perhaps categorizing the MP3s, and so on, some keyboards like the PA800, PSR S900 have limitations in HOW many items/files are inside a SINGLE folder, so, my sugestion is to make several folders, I would consider to include some 200s files per folder, it will help you to find files eaiser by category, like: instrumental, dance, jazz, latin, medleys, Rock&Roll, Country, etc. Instead of scrooling to a single list of 1600 files.
I hope it helps you. ;o)
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mdorantes