get_sound_master_volume
This function gets the master volume for the sound mixer.
double get_sound_master_volume()
Parameters:
None.
Return value:
The master volume between -100 and 0. Default is 0.
Remarks:
The master volume works similar to the master fader on a mixing desk. It controls every sound that is played during the game and works independently of a sound object's volume control. This means that you can continue treating the volume of individual sound objects exactly the same as before, where 0 is always the maximum based on the current master volume. This can be useful if your game uses quiet TTS output and has a rather loud or busy soundscape.
Please note that these functions do not apply to the Windows volume control, only sounds that are played from within the game itself.
Example:

    // Set the master volume to -30 and retrieve the new value.

    void main()
    {
    set_sound_master_volume(-30);
    alert("Sound master volume", "The sound master volume is " + get_sound_master_volume() + ".");
    }