if (resume == 0)
{
    volume -= fadespeed;
    if (volume < 0.05)
        volume = 0;
    caster_set_volume(mysong, volume);
    if (volume == 0)
        caster_pause(mysong);
}
if (resume == 1)
{
    caster_resume(mysong);
    volume = 0;
    resume = 2;
}
if (resume == 2)
{
    volume += fadespeed;
    caster_set_volume(mysong, volume);
    if (volume > fvolume)
    {
        volume = fvolume;
        instance_destroy();
    }
}