Gidday. A simple query I hope, to do with sound system in Disco 4. There is a USB port under the lid of the central binnacle in the front seating. When I insert standard USBs with MP3 music files it apparently cannot read these as the screen response shows "connecting", but reverts to "insert USB". The manual says something about needing to set system to recognise MP3 files, but no details on this. Any thoughts? Many thanks. ChrisR