Homepage: http://vrokolos.blogspot.com/2008/03/change-speaker-mode-using-command-line.html This program changes the speaker settings under Control Panel -> Sound and Audio devices -> Advanced -> Speaker Settings using command line. Useage: speakersetup.exe [Speaker Mode] [Speaker Mode] can be one of the following: hp: Stereo headphones 1: Monophonic speaker 2: Desktop stereo speakers (2.0) 4: Quadraphonic speakers (4.0) 5: Surround sound speakers (5.0) 5.1: 5.1 surround sound speakers 7.1: 7.1 speakers Examples: "speakersetup 5.1" will switch to 5.1 surround sound speakers. "speakersetup hp" will switch to headphones.