Wow, a 270 - cool. So did you go to a key of A Power Chromatic, or a key of C Power Chromatic starting on A?The harmonica I used was a Hohner 270 classic which I retuned from a stock A harp.
I haven't tried it, but visually, it looks very advantageous.I think the half-valved Power Chromatic tuning is an upgrade of the standard chromatic harp, it can do better in almost every aspect, and every chromatic harp player should give a try, whichever genre he or she focuses on. I love it when it has a traditional sound on classical and folk tunes, I also love it when it sounds so much like a blues harp when playing blues and ethnic tunes, I use it for almost every music I play.
As an aside, I feel the same about the Diminished layout. It's pretty interesting to compare the Diminished Layout and the Power Chromatic.
As I recall:
I) PC has a whole step in every hole like the Dimi.
II) PC is based on two "blow/draw" Dorian tetrachords like the Dimi (if you start a key of C PC on A):
Dimi:
first dorian tetrachord: A B C D
second dorian tetrachord: Eb F Gb Ab
Power Chromatic (from A to A)
first dorian tetrachord: A B C D
second dorian tetrachord: E F# G A
III) They both have 4 enharmonics.
Dimi in C: C Eb Gb A
Power Chromatic in C: G A Bb C
So theoretically, it seems like PC would be the way to go for more diatonic stuff and Dimi for fully chromatic stuff, although there must be a lot of common ground as well.
Anyway, I don't mean to hijack the thread. You sound great!