Add support for more sound channels

Registered by Renegade on 2011-12-04

On an 5.1 system, YR uses only the front left and the front right channels as sound output, the others are silent.

##### ADDITIONAL INFORMATION #####
This doesn't need Pro Logic or other complicated stuff. IMO a following script is enough (first is left channel, second is right, values are percentages) (a similar script is used by my ffdshow to remix 2.0 input into the 5.1):
Center (0,75; 0,75)
SideL (0,75; 0)
SideR (0; 0,75)
BackL (0,5; 0)
BackR (0; 0,5)
Back Center (used by old Surround) (0,5; 0,5)
Subwoofer (0,75; 0,75)

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