Toshiba Portege 4005 User Guide - Page 151

151 WinDVD Customizing WinDVD 2 In the Audio channels box, select the appropriate speaker mode to match your setup as follows:
If you have two speakers, select one of the 2 speaker modes. Mono mixes the audio channels into one channel. Stereo mixes the audio channels into two channels. Dolby Surround Compatible mixes the audio channels into two channels plus Dolby Pro Logic Surround sound. 3D audio provides standard 3D audio sound.
If you have four speakers, select 4 speaker mode. WinDVD distributes four unique sound channels to the speakers, providing a true surround sound experience.
If you have six speakers, select 6 speaker mode. WinDVD automatically distributes 5.1 sound channels to these speakers, for enhanced surround sound.
If you have an S/PDIF compliant sound card, select Enable S/PDIF output. This option sends the stereo output through the sound card to an external receiver. 3 In the Vocal options box, select the desired option for DVDs that support vocal as follows:
No vocal does not output vocals to any speaker.
Left vocal outputs vocals to left speakers only.
Right vocal outputs vocals to right speakers only.
Both outputs vocals to both left and right speakers. 4 In the Dolby Pro Logic box, select the Always enable check box to enable Dolby Pro Logic. Clear the check box to disable it. 5 To test Dolby Pro Logic, click the Test button.