Nope, that's as random as it gets. Actually, to do something like what you are requesting would actually reduce randomness, but that's probably really what you would like anyway. For example: randomly pick a sound from this list, but don't play any sound more than x number of times until each sound as been played at least y number of times. I'll consider adding a setting along these lines, but this gets close to that "too complicated" line, where too many options and features makes the program that much harder to use. (Unfortunately, I think the program is probably there already.)