So you sent them a very important video detailing sound differences? What happens if the operator is stone cold deaf?
You have to understand everyone has differing rates of hearing, depending upon where they have worked in certain LOUD factories, throughout China/US.
Congratulate you for trying something here but do be aware relying upon 'individuals' to make decisions with testing and audio, might not bring you the results you are ultimately hoping for.
If it can be tested via strict machine/computer control leaving out humanity altogether, then you may have something that will work.