This answer applies to R4 Mk3 R4i Mk2
Tracks and folders on the USB are played in stored order. To quickly arrange your music, you can do so on your PC by renaming the files i.e. 1, 2, 3 before copying them to your USB. Windows will copy files in alphanumeric order so they will be stored in the correct order for the R4. This principle also applies to the folders/albums on the USB. The order folders are stored on the USB will take precedence over the tracks so it is possible to add tracks to the end of specific albums.
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