Each CM-30 is equipped with three input channels, with one XLR input for mic/line, and two additional Aux inputs that support RCA pin (L, R) and stereo mini-phone connectors. So with one CM-30 you get four stereo inputs and one mono input. The Stereo Link function allows two CM-30s to be linked for true stereo output, which enables a total of eight stereo inputs, and two mono mic/line ins. The CM-30 offers more than enough inputs to simultaneously connect a microphone, a keyboard, a rhythm machine, and a CD player, or to function as a mini PA rig.