E-7HP-A3 settings[INPUT SEL] switch setting• To monitor a signal from your computer, set this switch to “USB”.• To monitor a signal from an external audio de -vice, set this switch to “OPTICAL”. [OUTPUT SEL] switch setting • To monitor a signal via headphones, set this switch to “PHONES”.• To monitor a signal via an ampliier/speaker sys-tem, set this switch to “RCA”. Volume settingUse the [VOLUME] control to adjust the sound vol-ume. The [VOLUME] control affects both the output levels of the [PHONES] an...