FRONT PANEL

Input:                     L and R Balanced or Unbalanced Line inputs (see Specification)
                                Jack Inputs Disconnect Rear XLR Inputs.
Master Volume:  Sets overall Maximum Volume Levels.
Mono:                    Converts all Headphone Outputs to Mono.
Bal:                        Adjusts Balance of Stereo input Levels.
Volume 1-4:         Sets Maximum Level to each individual user including Remote Volume.
                               Available less front panel controls and jack sockets. Remote Control Only.

REAR PANEL 

VCA Remote Port Connections in PDF. 

Remote control Unit,  free standing or panel mounted.