The ACS 4.4 G2 provides matrix audio switching of 4 stereo inputs to 4 stereo outputs. Matrix switching allows any/or all inputs to be assigned to any/or all outputs. The ACS 4.4 G2 may be controlled via its front panel rotary encoder control knob and TAKE switch, contact closures, open collectors, logic and/or the multi-drop RS-232 serial port (USB or Ethernet optional). Installation is simplified with RJ45 audio jacks for input and output connections and plug-in euroblock screw terminal connectors for expansion and remote control.