MIDI keys, change of selected staff leads to sustained audio
Barely a problem, and only seems to affect sound engine.
For clear example use sound that does not decay, ex. Sine wave
1) Enable midi input, and have score with more than two staffs, and select one of them(not in notation mode)
2) Hold down one or several notes on midi input
3) While still holding said notes, select a different staff with cursor
4) Release notes and audio keeps going
Again, barely a problem, and only noticed it when using Sine wave sound
To remove sound select first staff and press the same notes.