# File lib/win32/sound.rb, line 148
      def self.set_wave_volume(left_channel, right_channel = nil)
         right_channel ||= left_channel
         
         lvolume = left_channel > MAX_VOLUME ? MAX_VOLUME : left_channel
         rvolume = right_channel > MAX_VOLUME ? MAX_VOLUME : right_channel
         
         volume = lvolume | rvolume << 16
         
         if @@waveOutSetVolume.call(-1, volume) != 0
            raise Error, get_last_error
         end
         self
      end