.....Just a thought on this remark: I've often thought wood combed harps sounded different to plastics. However, I've come to the conclusion that the reason is exactly as stated above.
I have fallen into the habit of deliberately using a slightly
leaky harmonica on some tunes because I want a light, reedy sound. Note
that when I say'slightly leaky', this may simply mean harps with more
offset to the reeds.
The harps that I have adjusted for overblowing sometimes do not
produce the sound might I want on a particular song.
Regards, Rick Dempster Melbourne, Australia