84.2. Special active source selection mode and setting adjustmentsUse the knob on the front panel to access special modes for selecting active sources andadjusting levels and equalization (bass and treble). You can access these modes by holding in theknob for a certain time and then turning it. By adjusting the level of each source you can mix thesignal from the microphone or line (LINE3/MIC) and another line (LINE1 or LINE2), and the result ofthis mix will be controlled by the general output volume of the unit together, in other words, respectingthe relative levels set of each source.The full procedure for accessing and operating in these special modes and the optionsavailable in each are set out in the following graph: