Surprised nobody's mentioned it yet - oil lubes are much more quiet than wax-based ones like white lightning et al. Phil's Tenacious Oil lasts long and is the most quiet thing I've used on a chain, geared or fixed, 3/32 or 1/8.

The downside is it picks up dirt much more and much more easily.

I also find that 3/32 stuff is quieter, but I've only used 2 of them vs one 1/8 setup, so inconclusive.