Best Brass e-Sax Alto - electronic mute system for alto sax, Type II, digital echo function with 3 modes, 3.5mm mini-jack input allows an external sound source to be combined with microphone sound. Mini-jack line/headphone output allows connection to earphones for private practice, an external sound system, or to a recording system. 3x echo modes (S/M/L), lightweight (only 2310g), compact size, very quiet (approx 69 - 89dB attenuation).