Practice Player Live Midi +Usb

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[version 3.1]
- bug fix when select file using external app

[version 3.0]
- basic soundfont is included and now does not need soundfont installer anymore
- now internal file browser is not limited to internal emulated storage and can browse all including external sd card.
- noise removed when music starts after load of each song
- now understand musicXml multi measure rest