[. . . ] [. . . ] Note: It is recommended that the iMultiMix be turned off before connecting and disconnecting any sources to the inputs of the unit. EFFECTS/AUX RET B: Controls the signal level of the internal effects or the level returning from AUX B if in use. These meters show the signal after the limiter, if the limiter is engaged. The limiter prevents the input to your iPod from overloading and causing unwanted digital distortion. [. . . ] [. . . ]