All attempts have failed - help? The dealer has injected a liquid multiple times with limited sucess - often the buzzing sound stops for 1-10 days. It is so loud on the Interstate that it leads to headache pain - conversation in the front seats is nearly impossible. I have been told the sound is due to the angle of the front glass and that the window gasket is apparently drying out.

yup dried seal, had the same issue mate. removed the windshield and replaced the seal, never heard it again!