Well the title says it all - more specifically looking for an addon that makes some sound alert for me when Tricks of the trade is off cooldown. (im using omnicc and pulse but I would love an audio warning)
I think Power Auras might be able to do this, but I couldn't be sure. It definitely has audio options, so just set it for when it comes off cooldown and the power aura should work. In theory.
I use Power Auras for my ToTt, you can setup Powa for any spell usable action, debuff, buff etc you can think of. Really this should be a core addon for anyone looking to present specific information for their character.
You can also look at Tricks or Treat on curse which will provide a audio warning for tricks, or just slightly before it comes off plus other more ToTt specific options.