Soooo I have the general concept that a more rounded tuning slide is more free blowing etc. A 72 bell is darker sounding than a 37 etc. A 43 leadpipe is bigger than a 25 and takes more air to blow. I am familiar with bachs, but I was wondering if you guys could elaborate more on the different sizes? Ive read the websites, some of it makes sense some of it doesn't. So if you could please elaborate on the different sizes of lead pipes, bell sizes, etc. I already know of the finishes and all. I just need it all explained in simpler terms.