The problem is actually again one of Meyer's original ideas again. You have a resonant tube with a bar shoved in the middle of it so all the math is going to have to be done the hard way.
This resonance is an audio property of the technology controlled by the gating frequency as that is how you tune in for it. The problem is we don't have any equations dealing with a resonant tube with a solid bar in the middle of it. The only way I have devised to figure this out manually is with a microphone. One day I will figure out the math to predict this but it's going to take a while but at least I do know one way to figure out the resonant frequency of such a combination.
Again this is why Meyer's technology is so hard to back engineer as there are a lot of original ideas within the technology.
This video will give you all a lot of insight in dealing with this part of the technology:
https://www.youtube.com/watch?v=DovunOxlY1kShalom,
TGS