PRE—EQ bypassed POST—EQ active L. LINE LEVEL - Adjusts the output level of the LINE OUT jack {N}. M. GROUND LIFT - Disconnects the LINE OUT {N} ground connection (pin-1) which may reduce hum noise in some situations. GROUNDED (normal) GROUND LIFTED N. LINE OUT - This jack allows you to send signal from the preamp section out to an external source (such as a house mixing console or a recording device). The on board “level” control allows for adjustment of signal strength. Use the “Pre/Post” contr