Yamaha SB7J Silent Brass Mute System -Experience the Evolution of SILENT Brass You want to play when and as you like, without being confined to time or place… Yamaha’s next generation SILENT Brass makes it happen. The SILENT Brass consists of a smaller, lighter, freer blowing Pickup Mute, and the Personal Studio, which features Yamaha’s exclusive Brass Resonance Modeling. Used together, the two deliver the natural acoustic tone you hear when playing without a mute, making it feel as though you are playing mute free.