How can a square dance stereo order songs by sequential numbers

I also encountered this problem, I am a sorority dance enthusiasts, at first I thought it was according to the name of the dance song the first hanzi alphabetical order, or the English order, or number order, confirmed, are not, and later found that it is according to the each song copied into the U disk in the order of the sequential playback, remember to format the USB flash drive before copying Oh. It's also possible that different speakers from different manufacturers have different playback settings

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