This is an answer I got from Mark Baxter, famous vocal coach who's students have included Steve Tyler of Aerosmith:

Hey Larry,

The buzzing is good news -- it's resonance! Any cavity is a potential resonator, and which one vibrates all depends on frequency. The size of your ear canal will only accommodate higher frequencies because it's so small. The bigger question is; why isn't the left ear buzzing? That's most likely an ear wax or tension issue.

Sometimes notes trigger a sensation inside my mouth that feels like my fillings are all about to fall out of my teeth. Some notes buzz my ears. These resonate pockets add subtlety the projected sound of your voice. Most importantly, they indicate a well produced fundamental at the larynx and that you have an optimal environment surrounding the larynx.

Good job!

Regards,

Mark Baxter