ZMX124 FX USB 12 Channel MIXER. Alto ZMX124FX 12 Ch Live Audio Mixer w/ USB and FX. Professional Live Mixing, Effects, and USB Audio in One Mixer. The ZEPHYR ZMX124FX USB is a 12-channel, 4-bus mixer with more than enough inputs, outputs, routing, EQ, and effects, for nearly any live performance reinforcement need. It features 6 ultra-low microphone inputs with balanced TRS jacks and insert points, a three-band EQ with a sweepable mid frequency on 4 channels, four channels of stereo inputs with 4-band fixed EQs, and a 4-bus assignable sub mixer. You also get 60mm high-precision faders and four AUX sends per channel (2 Pre/Post switchable pots). The ZMX124FX USB gives you the all the features you need to mix any professional live performance.