Do you have 7.1 sound card? Do you hear missing channels if you switch rear speaker output to side speaker output? (or vice versa, not sure how they are labeled in 7.1)
I just noticed something possible stupid in ksmedia.h header file, there are two different 5.1 speaker settings, obsolete and XPSP2+ version. Only difference: rear speakers are replaced with side speakers..
Includes interesting comment:
// The following are obsolete 5.1 and 7.1 settings (they lack side speakers). Note this means
// that the default 5.1 and 7.1 settings (KSAUDIO_SPEAKER_5POINT1 and KSAUDIO_SPEAKER_7POINT1 are
// similarly obsolete but are unchanged for compatibility reasons).
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