There are lots of alternate tunings that can produce missing notes (while eclipsing others.) Of course, powerbender is another matter entirely. Haven't learned it yet. I must take issue with you on two specifics, however.Larry marks wrote: <In 2nd position, it is not possible to play the minor 3rd of the I chord <(note between 6D and 7D) or the major 3rd of the V chord (note between <5D and 6B) without OBs or a valved harp.
On a standard-tuned harp, you mean... There are lots of ways to get the desired notes, and overblowing isn't the easiest. Retuning the harp is the easiest way to get the missing notes.