Sets the number of output channels for this track. If output channels number is less than input (for example 5.1 to stereo) then mixes the channels together.
To prevent mixing you can mute unneeded channels first.

Sub TrackChannelsSet( _
   ByVal _nOutputChannels As Integer _
) 

void TrackChannelsSet( 
   int _nOutputChannels
)

procedure TrackChannelsSet( 
    _nOutputChannels: Integer
); 

void TrackChannelsSet( 
   int _nOutputChannels
) 

track.TrackChannelsSet(10)

track.TrackChannelsSet(10);

track.TrackChannelsSet(10);