Making an object grow slowly

I've got a script that is triggered by a parent prim (using the standard controller methods), only the scaling doesn't seem to be working correctly. The object is meant to be worn as an attachment, with the child prim invisible until the trigger is received. At that point, the child prim should become visible and increase in size (and alter it's position of course), however, I don't want the size change to be instantaneous - I want it to be incremental. I tried putting the scaling into the timer script (necessary to keep the facial animation going), but it's not working, it just pops in full size.

If you need a visualization, parent prim is a small prim inside the mouth, child prim is a larger object outside the mouth (think blowing a bubble or balloon). Parent prim sends the following command when triggered:
llMessageLinked( LINK_SET, FALSE, CONTROLLER_ID, NULL_KEY );

This is the child prim code:

integer side = ALL_SIDES; // 0 = top side of prim, you can use ALL_SIDES too.
float off_alpha = 0.0; // 0.0(no-alpha) to 1.0(max)
float on_alpha = 1.0; // 0.0(no-alpha) to 1.0(max)
key p;
string  CONTROLLER_ID = "A"; 
integer AUTO_START = TRUE;   
integer grow = 0;
vector scale;

default {
    state_entry() {
        llRequestPermissions(llGetOwner(), PERMISSION_TRIGGER_ANIMATION);     
        if ( AUTO_START ) 
            llSetAlpha( off_alpha, side);  
        else 
            llSetAlpha( on_alpha, side); 
    }

    on_rez(integer s)
    {
        if (p != llGetOwner()) 
            llRequestPermissions(llGetOwner(), PERMISSION_TRIGGER_ANIMATION);
    }

    run_time_permissions(integer perm)
    {
        p = llGetOwner();
    }
    
    link_message( integer sibling, integer num, string mesg, key target_key ) {
        if ( mesg != CONTROLLER_ID ) { // this message isn't for me.  Bail out.
            return;
        } else if ( num == 0 ) { // Message says to turn alpha on (remove transparency):
            
            llSetAlpha( on_alpha, side);
            llSetTimerEvent(.1);
            
        } else if ( num == 1 ) { // Message says to turn alpha off (set transparent):
            
            llSetAlpha( off_alpha, side);
            llSetPrimitiveParams([PRIM_POSITION, llGetPos() + <-0.038, 0, 0.047>, PRIM_SIZE, <0.040, 0.040, 0.094>]);   
            llSetTimerEvent(0);
        
        } else { // bad instruction number
            // do nothing.
        } 
      }       
    timer()
    {
        grow ++;
         llStartAnimation("express_surprise_emote");
         if (grow < 10)
         {
         scale = llGetScale();               
         llSetPrimitiveParams([PRIM_POSITION, llGetPos() + <0.004, 0, -0.005>, PRIM_SIZE, <scale.x + 0.009,scale.y + 0.009,scale.z + 0.02>]);
   
        }
         else if (grow == 10)
         {               
         scale = llGetScale();
         llSetPrimitiveParams([PRIM_POSITION, llGetPos() + <0.002, 0, -0.002>, PRIM_SIZE, <scale.x + 0.004,scale.y + 0.004,scale.z + 0.02>]);
   
        }
    }          

        
}

It compiles and runs, but the scaling doesn't seem to be happening. Any help is appreciated....

The script worked for me (once) when I made the following changes to the variable types in the llMessageLinked:

llMessageLinked( LINK_SET, 0, "CONTROLLER_ID", NULL_KEY );

And then changed the child message to:

link_message( integer sibling, integer num, string mesg, key target_key ) {
if ( mesg != "CONTROLLER_ID" )

The child prim appeared and grew. This script also did something odd to my avatar, making it bend over at the waist after I stopped the emote animation. I don't think I want to know what you are using this for ;-0.

LOL - No clue why it did that - it's just the "surprise" facial animation. Anyway - I still can't get it to work. Think I'll go back to the basics and try again.

Ok admit it... this is a penis script isn't it?

Your problem may be that the script doesn't reset after it is run the first time, so it will only work once. I don't know why it would work for me and not for you. If you'd like, I can drop my test object in your inventory next time I'm in world.

It's not a penis script. If you must know, it's for the "Ton Tongue Toffee" I'm working on. Sheesh.