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When browsing folders, how is the order in which tracks on USB memory devices, USB hard disks are played determined?

The files are played in ASCII code order. Normally they are played in the following order:

1. By capital letters

2. By small letters

3. By number of characters in file name

4. By symbol

5. By "kana" characters

The playback order is determined by the file name (not by the ID tag).