Well, not that I know of. You can look on Youtube, but I wouldn't trust anything that isn't Joy of Satan or at least affiliated with Joy of Satan.
The way you're supposed to pronounce it is TH-OO-TH, but (now here's the tricky part.) you have to hold the TH sound by vibrating your tongue between your teeth, whilst pronouncing the OO part. This could take some work, but it is one reason why I choose mental vibration, it's more discrete, effective, and easier in my opinion.
Is there some sort of video that explains how to use the mantra for the opening of the third eye correctly?