Monitoring Aux 1 In The Phones Jack - Alesis MULTIMIX 12R Reference Manual

Applications

Monitoring AUX 1 in the PHONES jack

If you are using AUX 1 as a monitor feed, you may want to check that
mix using the headphones. If you've connected the PA or recorder to
the MAIN OUTPUTS, and are not using the TAPE IN jacks, use Y-cords
to connect the AUX 1 SEND to the TAPE IN jack(s) at the same time it
feeds the monitor amplifier. Use the front panel
[PHONES/MONITOR] switch to select between the main and aux 1
feeds.