Once Smokey-Joe mentioned the at the straight harps the air is
concentrated like at pipes. Absolutely, and further advantages are
the shorter slide way and above all the diminished effect of the air
holes when shifting the slide which even can be heard at the higher
notes of a crossed chrom brand.
In order to prevent a possible misunderstanding, the mere reed position
isn´t the problem but the bigger mpc holes of straight chroms.
Well, in former years I changed both the crossed reed tuning and the
mpc holes.