Hi,
I am Sourabh Jain, I am interested in the project. I have written scripts for thinkorswim for client here, please check my profile for customer review. I can write the alert (text and sound) for you as heikin ashi changes color. I will write script on my local machine and send it to you, you can run simple import it and use it, I will send you images of how to import and use it.
Regards
Sourabh