To do this, I would just use a sprite. This will also allow you to
fade, resize, etc quite easily. I have modified your code to do this.
Sync On
Text 0, 0, "Prova timer"
Get Image 1, 0, 0, 100, 12
T = Timer()
Alpha = 255
Do
Cls
Elapsed = (Timer() - T) / 100
If Elapsed >= 1
y = y + 1
Sprite 1, x, y, 1
If Alpha > 0
Dec Alpha, 1
Set Sprite Alpha 1, Alpha
EndIf
Elapsed = 0
T = Timer()
Endif
Sync
Loop
What I'm doing here is printing the text to the screen, and then
grabbing it with the GET IMAGE command, then I make it into a
sprite. So basically I am turning the text into an image and
displaying that to the user.
I then make it slowly fade away using the SET SPRITE ALPHA command.