One possibly negative thing about the audio player is that the track is reloaded with every play. This results in a few seconds of silence each time it is repeated. So you can’t use this one if you want real non stop repetition without any silence.
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FE File Explorer
Hello! This is one thing the FE File Explorer app can do.
It does many many more things, but it has DropBox support, a built-in audio player and you can set it to repeat one track. Find it here: https://itunes.apple.com/ch/app/fe-file-explorer-pro/id499470113?mt=8
PS File Explorer
One possibly negative thing about the audio player is that the track is reloaded with every play. This results in a few seconds of silence each time it is repeated. So you can’t use this one if you want real non stop repetition without any silence.