4 Channel VGA Input Card for Multimedia 16 x 16 Matrix Switch (500470). The VGA Input Card (500474) is a 4-channel module for MuxLab's Multmedia 16x16 Matrix Switch. The card allows up to four VGA sources to be switched and/or distributed via Cat5e/6 cable. The card features four HD15 inputs. Stereo Audio is supported using the VGA/Audio adaptor cables that are included. The 500474 converts and scales all VGA channels to HDMI format for transmission via the HDMI and/or HDBaseT output cards.