This is the schtick to do additional damage.
You are a maestro at gunplay. You can judge the timing and timbre of each shot so as to cause a maximum of hurt. This schtick can be taken several times, and each time you increase the damage you inflict with guns by two, with a maximum bonus equal to your Perception.
You may not put more than half your Guns Schticks into Symphony of Slaughter; in order to take this once, you must already have another gun schctick; to take it twice you must have three and so on.
Does not work with any kind of area attack.