MB-1622A.12 line microphone or line iuput, 2-line stereo input..There are indicators of signal and peak volume in input channel..Input channel has a equalizer with 3 frequency bands..Single channel has an inserting function..4 groups of level indicator that display main output and grouped output..Main output with 2 modes of output, balancing output and non-balancing output..Grouped output is a non-balancing output..16 built-in optionally digital effects.. +48 phatom power is available in the unit..With change-over switches of 115 VAC and 230 VAC..Stereo earphone output can monitor the signals of main output and various channel input..2 ways of auxiliary input.