Hello! Could someone help w/ a trigger issue?

I need help making a trigger which would allow a unit to say his transmission when he uses a certain ability.
I have seem to make this work for the ability "Mirror Image" and it workedbut currently I'm trying to do it for "Critical Strike" and the trigger never seems to work(I've changed the percentile for it to 100.00) what do I do?

maybe a trigger like ye said

• PlaySound
  • Events
    • Unit - A unit Begins casting an ability
  • Conditions
    • (Ability being cast) Equal to Critical Strike
  • Actions
    • Sound - Play YourTransmissionSound <gen>

i aint sure but maybe this

You cannot detect critical strike ability (generally passives).

Passive abilities don't follow the Unit - A unit begins/finishes/starts casting/the effect of an ability.
Use this:

• Trigger1
• Events
  • Map Initialization
• Conditions
• Actions
  • Custom script: set bj_wantDestroyGroup = true
  • Unit Group - Pick every unit in (Units in (Playable Map Area)) and do (Actions)
    • Loop - Actions
      • Trigger - Add to Trigger3 <gen> the event (Unit - (Picked unit) takes damage)

• Trigger2
• Events
  • Unit - A unit enters (Playable Map Area)
• Conditions
• Actions
  • Trigger - Add to Trigger3 <gen> the event (Unit - (Triggering unit) takes damage)

• Trigger3
• Events
• Conditions
  • (Level of Critical Strike for (Damage source)) Greater than 0
• Actions
  • If (All conditions are true) then do (Actions) else do (Actions)
    • If - Conditions
      • (Random integer number between 1 and 100) Less than or Equal to ((Level of Critical Strike for (Damage source)) * 10)
    • Then - Actions
      • //You detected the critical strike
    • Else - Actions

The condition above is the formula you need to use for your critical strike ability. Up to the chance per level, you will need a different formula. The one from the example has the chance of
Level 1 - 10%, Level 2 - 20%, Level 3 - 30% and so on.