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/* 
 * Set the stereo volume level.
 *
 * Examples:
 *   remote.set_stereo_volume left, right
 *
 *   stereo_volume = [10, 0]
 *   remote.set_stereo_volume *stereo_volume
 *   
 */
static VALUE xr_set_stereo_vol(VALUE self, VALUE l, VALUE r) {