As I mentioned in another thread I am currently attempting a "comeback" after about 3 years away from serious playing, due to having brain surgery 2 1/2 years ago. I'm starting to get some chops back but I am also starting to feel some discomfort in the back of my head (where I had the surgery) as I start to push the volume and range. To me, it feels like a lot of this is coming from resistance in my horn/ mouthpiece whatever. I know that there is always going to be SOME amount of resistance, and I also know that there are a lot of things I can try to address as far as a more relaxed approach and not overblowing etc. but I have been wondering if a less resistant, more free blowing horn would help me along the way. A good friend who happens to be an excellent brass repair tech and trombone player and I have been talking about this all lately and it's his feeling that more less there is no such thing as a more or less resistant horn because no matter what the smallest point is always at the throat of the mouthpiece and anything after that really doesn't matter. Logically, I see his point... but you always see comments about how "free blowing" a horn is and I really FEEL like there was a big difference back when I was playing an old .470 bore Besson Meha. What do you all think? Are there differences in the resistance of horns or is all the "back pressure" from the mouthpiece throat and things we create with our technique? Does anybody have any feelings as to whether switching to a horn that people classify as "Very free blowing" (like a Callet Jazz that I have been looking at) MIGHT be helpful to me? I'm not looking for a super horn that is going to magically fix all of my problems. I know that it doesn't exist, and that most of the changes are going to have to come from ME and not equipment, but at the same time I want to have equipment that is going to help me along the way. I hope this all makes sense and I look forward to all of your thoughts!