Noel has clearly shown what's going on here, but we still don't know why it happened. I've seen it happen before occasionally (usually when entering, then deleting, then changing notes). But don't know exactly what caused it. I just fix it by changing the duration of the note (right click on the note and enter a new duration).

Also, for completeness, while the vertical line generally presents itself as the volume heard, technically it represents the note's velocity.


John

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