Isn't that the beautiful thing about internet? The truth is usually out there somewhere, you only have to sort it from the other stuff. Seven months back, I started playing again, never having been able to buzz my lips. After some web research I figured that I'd better get with the program and develop a buzz - I was so diligent that I almost needed a windscreen wiper on the inside of my car. As I was also getting heaps of mouthpiece time things got better and I gave credit to the buzzing as part of my improvement. The Charlie and Greg videos and also one that Allen Vizzutti did showing air going through the MPC with no sound until the lead pipe connected put things in a different perspective (and affirmed that my old teachers weren't far off the money). Rethinking things around aperture and airflow has worked well for me. Just blowing air through the aperture without even trying to buzz has become a nice warmup routine too.