Physiology of the Tremolo & Vibrato.

Hi folks,

I have a question based on the more anatomical side of things. David, I've really enjoyed your explanation of tremolo and vibrato in your lessons. In fact, you're the first to flag to me that the vibrato is more so a relaxed extension of the tremolo, rather than, say, an enhanced skill. I'm the type of learner that finds it particularly difficult to grasp things unless I'm fully aware of the basic raw fundamentals of it, so this helps a lot.

  Extending from that, I was hoping you might elaborate more on the source of the perturbation. There's two origins that I'm concerned with:

(1) Throat manipulation can come in the form of that classic sheep/machine gun sound. Done lighlty, I feel a light pop in my throat, both on the in- and ex-hale.

(2) Then there's the kind that can arise from trying to articulate "gck, gck, gck". It's a similar pop, perhaps a little higher in the throat. I can perform this one with more force, and my larynx moves. This feels more like the extreme back of my tongue is getting involved, but force seems to be easier to generate with this move (could be simply that my underdeveloped throat muscles struggle with (1), though).

  Which method do you think is on the more correct path? I've seen many players refer to and display the movement of the larynx as part of their rich vibrato etc. This occurs in (2) with no jaw movement and the diaphragm is largley unaffected, it seems correct. However in (1) the tongue seems less involved, but the diaphragm seems to pop a little in my case, it also seems correct in a way.

Hope this wasn't too confusing; just hoping to establish good fundamentals in the first instance!

Much appreciated.