Think of the chromatic harmonica as 3 different instruments.
The low notes, the middle register notes, and the high notes of your chromatic harmonica all require a different playing technique...to create seamless superior quality tone over various octaves, and that means more beautiful sound...
Tutorial by chromatic harmonica artist, inventor, and performing artist David Kettlewell
To learn more of chromatic harmonica, see his book LOVE OF CHROMATIC HARMONICA...TECHNIQUES AND ADVICE FROM THE WORLD'S BEST!....paperback and Kindle on Amazon