Okay, why didn't anyone ever tell me about this before?
Because, Mr Anderson, you didn't need to know. Nor do you need to know that this works differently from Least Recently Played: if you skip a song as soon as it comes on, it doesn't count as "played" for LRP or play-count purposes ('cos you haven't really heard it), but it does count as "played" in the separate flag used for bipartite shuffle: you've just skipped the thing once, it'd be perverse to try and play it to you again straightaway. You don't need to know because all you, as a user, perceive, is that you are lucky about what comes up in reshuffled playlists. You are not lucky, Mr Anderson; we are carefully scripting your "luck", behind the scenes.

(I can't answer bonzi's question about whether it was the BBS that suggested this: it was already done by the time I joined Empeg.)

Peter