The FM41 is a microprocessor controlled, automatic switching, five-channel mixer. The four microphone inputs are XLRF-type balanced, with 48-volt phantom power available on pins 2 and 3. The Aux input is an RCA jack accepting auxiliary-level input from sources such as tape decks and VCRs. There is no signal processing of the Aux input. The mixer output is XLRM-type balanced, non-inverting.