Probably the most important factor in harmonica customizing is the reed set-up. I believe that stock reed set-ups are probably the single most determining factor in which harps players choose in spite of the fact many will say it is the comb construction, tuning, etc. Reed set-up is a personal choice that varies among players and the reasons are infinite, but when you get down to it (Or on it), your playing and sound is determined by the way the reeds are gapped. Low reed