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I've a good few thousand miles under my belt since I posted this thread and got through a fair handful of cranks / chainrings / cogs /chains.
In my experience excessive noise (as in noisy enough to actually hear when riding) will mainly come from either lack of lubrication or too tight a chain.
Chainline can be out by a fair bit without contributing massively to noise. You do get certain chainrings / cogs / chains that just happen to be noisier than others.
If you can rule out any of those then I guess your carbon frame could be amplifying the noise but personally I've never used a carbon frame for fixed gear.....
aniki
Just built up a carbon frame , carbon rims . New sproket , cog and chain ...
It's so loud ! I have a friend who's a builder and he has a laser to check everything is in line, but I may try different chains if everything is all in line perfect