Even more so given the amount of the afternoon spent watching morris dancing (unintentionally I should add - eating lunch, minding our own business then suddenly surrounded by bells, sticks and waving hankies). Definitely a set-up I'd like to revisit should the opportunity arise. (The horns not the morris folk)

Did you come across anything relevant relating to analysis of the actual sound produced? ISTR getting sidetracked into reading a fair bit about vocal technique which was interesting in it's own way but for a different set of reasons.