Why does Band-in-a-Box generate notes below low E (E2) on a MIDI bass part?
You can set the lowest bass note in the Band-in-a-Box | Preferences(2) dialog. If you have set your lowest bass note to E2, which is the default setting, Band-in-a-Box will not play any bass notes below E2, with one exception: Band-in-a-Box occasionally produces a short low bass note (usually an octave below the root) to simulate a muted bass note on the third triplet of a walking bass line. These short notes don’t get displayed in notation, but do get played.