I have been forced to use an old Dimension 2400 running WinXP MCE. I would like to retask the rear audio-input jack to serve as output for a low-tech 4-speaker configuration consisting of 1 "front" set and 1 "rear" set. The problem is I cannot find a graphical user interface for the SoundMax v18.104.22.16840 driver installed on this old Dimension 2400. If there is no companion app for the SoundMax, is there another configurable audio driver somewhere that permits the functionality I am seeking? The Sound option on the control panel does not provide this functionality.