Global variable/fade out not triggering

I'm using GameMaker 2.

Trying to get a piece of code to work that when an alarm hits 12 seconds, it changes a global variable within the object which then triggers the object to carry out it's normal process - fading the screen out to black. However it isn't working and I can't figure out what isn't working.

This is the code I have at the moment;

Create:

variable_timer = 100;

global.fadeoutsimilarities = 0;

alarm[0] = room_speed * 12;

Step:

variable_timer-=1;

Alarm 0:

global.fadeoutsimilarities = global.fadeoutsimilarities + 1;

Draw:

if (global.fadeoutsimilarities)
{
   draw_set_color(c_black);
   draw_set_alpha(variable_timer/30);
}

else {}

Any ideas on what's preventing it from fading out to black?

The variebla global.fadeoutsimilarities = 0; it is a numeric variable and when placing global.fadeoutsimilarities = global.fadeoutsimilarities + 1; you are telling him to add up to 1, then I will be 1 then 2, 3, 4, ... and so, and in event draw you place the conditional if (global.fadeoutsimilarities) which means if global.fadeoutsimilarities = 1 it will be black, but this will only happen during a frame in a blink, the solution is to change the values ​​of global.fadeoutsimilarities by true and false, it would look like this:

Create:

variable_timer = 10;

global.fadeoutsimilarities = false;

alarm [0] = room_speed * 12;

Step:

//without code

Alarm 0:

global.fadeoutsimilarities = true;
variable_timer -=1;

Draw:

if (global.fadeoutsimilarities)
{
   draw_set_color (c_black);
   draw_set_alpha (variable_timer / 10);
}

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