Thanks Moonbiter, I almost posted the link until I saw yours and caught myself. Crank the ambience strength up to full. P5 added the Ambience Strength and now any prop which doesn't have it (like all of mine, as I don't have P5), it assumes is 0. Me, if I'd programmed for P5, I'd have made it take it from the relative luminosity of the ambient colour if it's not otherwise specified. But they didn't ask me. B^)