Philips 4-Channel Sound Card - Manual (Page 36)

Philips Seismic Edge
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For 4 speaker setups (left front, right front, left rear, right rear) select
''Quad output mode''. This will enable quadraphonic playback for 3D
applications. Stereo (2D) will also be automatically converted to
quadraphonic including games, cut scenes, midi files, sound (.wav)
files and movie (.avi) files using QSound Multi-Speaker System 
(QMSS ) .
Philips 4-ch-091100-11-40.qxd 2000/9/11 AM 11:39 Page 36