I just wrote a post about how to use subtone practice to improve your tone. Here it is: http://everythingsaxophone.blogspot.com/2013/04/benefits-of-subtone-and-diaphragmatic.html
Thanks for this Sub tone post...
you don't mention anything about reeds or mouthpieces and combinations there off.
Seems like sub tone is better for Bari's & Tenors, rather than Alto's or Sop's?????