Music fade out in one specific area

Is there any possible way to make my main music track fade out and another fade in, and vice versa when leaving said area? I'm using UDMF

In the editor under Things/Sector actions you can find Actor enters/leaves sector. Put them in a sector and make them run a script. Or use linedefs to do the same. I used a script like this:
 

int musicVolume = 1.0;

Script "Music03" (void)
{
    while(musicVolume > 0)
    {
        musicVolume -= 0.025;
        SetMusicVolume(musicVolume);
        Delay(1);
    }

    SetMusic("D_MAP03");

    while(musicVolume < 1.0)
    {
        musicVolume += 0.025;
        SetMusicVolume(musicVolume);
        Delay(1);
    }
}