--music-volume=<value>LW6_MUSIC_VOLUMEmusic-volumeType: float.
Default value: 0.6. Min value: 0. Max value: 1.
Set the music volume.This is a floating point value. 0 is mute. Maximum value is 1.
--snd-backend=<value>LW6_SND_BACKENDsnd-backendType: string.
Default value: ogg.
Sets the sound backend AKA 'snd' to use. Can be 'ogg' or 'csound' but only 'ogg' will produce sound in the current release.