Just getting into harmonica and found yor presentation interesting and helpful. Understand diatonic harmonicas are set up to play one key, although skillled players can play more, and for this reason many player use multiple harmonicas in various key suited to the songs they play. But why are chromatic harmonicas also available in other keys as well as C, such as Bb, G A and D?
Filip Jens the great Swedish harmonica player has been talking about this a lot lately. Some "positions" on the harmonica allow for better slide ornaments. I wrote a blog post about this check it out chromaticlessons.com/2021/05/21/what-about-chromatic-harps-in-tuned-to-other-keys/
