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@middleofnowhere
I have a similar but not quite so noisy problem as to OP.
I haven't checked this by measuring or asking anyone who knows but my chain, which I believe to be 1/8, seems much wider than the teeth on my chainring. As far as I can tell the noise is being generated by the chain moving laterally across the chainring. What seems to make the difference is that I've got the chain tension too high which causes a slight twist in the chain where it sits on the chainring causing it to ping across rather than just slide.
I've just been too lazy to sort it but as I got a slow puncture this morning I'll prob get round to doing something about chain tension at the same time.