Yeah, the chromatic sounds like ‘Honey in Warm Milk’ where as the blues harp and marine band harp have a harsher sound.
Harp adjustments; http://www.youtube.com/watch?v=fkqmXP9IVyg
Harps are tough, just found my first harp, a Hohner Blues Harp, circa 1969/70, been dipped in beer, booze, water, not to mention the spittle and ya know they come apart, wiped it out and off, did the tune up like in the video, put it back together (needed a couple new brads) and it never sounded better…the cowling is a bit bent, but hey. 
Check out the ‘HarmonaCats’ http://www.youtube.com/watch?v=fGyNLiWUJzA United Audio great Bill Putnam recorded them in the men’s room at the , I believe and correct me if I’m wrong, Empire State Building due to the quality of natural reverb in the can, so to speak.