I do my best to completely ignore chain noise except re: lubrication or mismatches between chain wear and cog wear. (I rotate cogs between several bikes.) I have found in general that chains like Izumi run noisy as do UAI cogs. I think that is because there is less rounding of plates and teeth. But I also feel this is probably a hair more secure re: throwing chains sop I am happy to live with the noise. (And I always find if I ride harder, the noise tunes out.)

Ben