The Roland A-50 is a MIDI keyboard controller designed to control connected MIDI devices, such as sound modules, effect units, and sequencers, allowing users to program various combinations for live performance. The unit features a memory back-up system to retain data even when switched off, though the battery supporting this circuit should be replaced every five years.
The manual is structured into four sections: an outline of the unit's basic structure and functions, a performance course explaining main procedures in Playing mode, an editing course for writing and calling functions in Editing mode, and a reference section including troubleshooting and appendix tables.
Various troubles will occur, such as the note continuing to sound.