I have many years as an amateur under my belt.
Because I have an insatiable curiosity, I not only want to know "what", I also want to know "why".
I am slowly getting used to a fairly deep Bach 7 (no letter) mouthpiece on a .485 bore Conn 5A cornet, trying to obtain the same control I used to have with a .460 bore cornet.
I still often hit a sour note when trying to slur "Can't Get Started", but I hit all the notes OK when I legato tongue the song.
Why?
I assume that the standard answer is "You still need to develop your flexibility more".
But the intervals between notes are still the same regardless of whether I slur or legato tongue.
So why does legato tongue help in playing those intervals?
Why does slurring make those same intervals more difficult?
*Why* does tonguing help the player to jump an interval?
- Morris