Need Macro / Script help

Hello, i came here in order to find answer for my question from specialists who know their work. And so this my question: I need to create macros or script that will use for example Hearthstone from your backpack IF you receiving some whisper or chat message. If this is impossible, there is may be any whisper or Party chat message. I need this script because i am rading everyday and in all raids my party shoud use Drums of Battle one after another, there is Addon that sends chat message when Drums of BAttle ends and i want your script to use that message and use Drums of Baattle automaticly from my backpack. Thank you.

This sounds very bottish. Having an addon respond to ingame events to have your character perform some other action could lead to a ban. Maybe others have other thoughts/ideas, but I would be careful about doing this.

Edit: As a simple workaround, I believe you could setup a castsequence on each character. (Lets assume you are a 3 boxer). You have to be careful not to spam the button, or you will cast drums twice.

Toon1: /castsequence Drums of Battle,,

Toon2: /castsequence ,Drums of Battle,

Toon3: /castsequence ,,Drums of Battle