Should we add music to the Teach Me lessons?

Hi all, We are taking a vote to find which version of our Teach Me lessons for students and teachers in special education prefer.

We have put up a demo page with three Teach Me lessons (30 seconds long) to compare just voice, with background music, or with amusing sounds.

Demo page:
http://www.mobymath.com/Survey/AdditionTrain.php

The question we need help on is: Which Teach Me Lesson is better and why?

Thank you for helping. I am looking forward to hearing your thoughts.

Best,
Wade
www.MobyMath.com