Currently BB allows users to manually enter slurs in the notation for musical indications (the slurs are not active, and do not modify the MIDI tracks or playback in any way).

Having slurs on the lead sheet is very useful feature for people who play instruments that depend heavily on slurs for correct musical sound, such as for violin/fiddle players, or for any bowed instrument (because all notes in a slur are played with one bow stroke).

However, the current BB slur implementation is not drawing slurs properly. As best I can tell, slurs are correctly drawn when the slur is to the very next note. For example, in a 3/4 time score of Silent Night, the first 3 notes (Si - I - lent..) are dotted-1/4, 1/8, 1/4. A 2-beat slur on the first note correctly ends on the second (1/8) note, which is also the second beat.

A 3-beat slur should cover all 3 notes of the measure, but instead the slur stretches into the next bar and connects to the first note there, making the slur longer than 3 beats (or MUCH longer, depending on the length of the first note in the next bar).

A better approach would be to fix the slurs so they end on the correct note and beat in the lead sheet, because

(1) the slurs are very important to people who play bowed instruments that depend on reasonably accurate slurs, and

(2) because what is the point of providing slurs if they don't even end on the right notes? In that case, the slurs are misleading, making it hard to trust lead sheets printed by BB.