I am not an authority on folkdancing or languages, but the Swedish word for "to waulk" is "valka", which is a completely different word than "gång". Nor have I been able to find any connection between waulking and gånglåt or any other Swedish folkdance. As I understand it, the gånglåt is a kind of processional march, or a dance that mainly uses walking steps. It should perhaps be emphasized that a gånglåt is a tune and not a song (in the Swedish tradition anyway). A comment from a Swedish mudcatter would be welcome!