I have 100% master, 75% music and 70% effect or something similar to that (maybe the %s aren't quite right, but they're in that order). (Also I use 8% on windows, with my standard apple earphones. They're alright but nothing special.)
Would be a better poll if it asked for the ratio of hitsounds/music volume. Doesn't really give any relevant results as it is. 40% music 30% hitsounds here.