Stanton RM.404 - Manual (Page 9)

RM.404 Top Panel (FUNCTIONS)
Section E: MP3/Aux In
15. MP3 / Aux. Input: This 1/8" Mini-jack (3.5 mm) input was designed for
easy access and connectivity to a variety of portable devices (portable MP3
/ mini-disc / CD players / iPods.) Use this input instead of having to re-wire
the back panel of the mixer or use adapters.
Section F: Mic Controls