Product Detail Rotary encoder for quick access to engine modes, effects and parameters, including ToneMatch™™ presets, zEQ, ParaEQ, reverbs, delays, modulators, dynamics processing, scenes and tuner Aux mode (channels 1 — 3) sends channels' dry, pre-fader or post-fader audio to aux output for connection to additional L1 systems or recording devices Independent level controls Channel volume, mute and FX mute (1 — 4/5) Master volume adjusts overall level of master output Phantom power applies +48V power to input channels 1 — 3 to drive specific microphones ToneMatch™™ cable provides audio and power to ToneMatch™™ audio engine from power stand . The "Bose T1 ToneMatch Audio Engine" is best product for you. We recommended Bose T1 ToneMatch Audio Engine