add: xine_set_param (gtx->priv->stream, XINE_PARAM_AUDIO_CHANNEL_LOGICAL, audio_channel);
context: gtk_xine_set_audio_channel (GtkXine *gtx, gint audio_channel){	g_return_if_fail (gtx != NULL);	g_return_if_fail (GTK_IS_XINE (gtx));	g_return_if_fail (gtx->priv->xine != NULL);//FIXME XINE_PARAM_AUDIO_CHANNEL_LOGICAL ?//	xine_select_audio_channel (gtx->priv->stream, audio_channel);}