Board Thread:Off Topic/@comment-25857155-20151110093941/@comment-26397825-20151118075918

Phantom and I combined a lance with a megaphone that is also used as a dubstep gun. Mainly because the force of the soundwaves pushes the user (who is very petite) around the field, so she gets all that force put behind her attacks and can move in and out of combat quickly.

You could do something similar. Or perhaps use the sound cannon as a way of magnifying the force behind a projectile, like a repeating crossbow bolt/stake launcher? Plus there are the pure crowd control capabilities of anything like that.