Azden FMX-42 4-Channel Microphone Field Mixer with VU Meters The Azden FMX-42 is a portable 4-channel audio mixer designed for professional and semi-professional field audio capturing. The FMX-42 features 4 balanced 3-pin XLR microphone inputs with individually switched +48VDC phantom power. A pair of balanced XLR outputs provide line level signal to cameras recorders, etc. Additional features include a switchable input limiter to reduce the possibility of overload distortion, Left / Center /