Current Projects chat and miscellany

I ve just built up my bike and the drive mechanism is incredibly loud
It a 1/8 th chain (i have read they are louder) and 1/8th cog and 1/8th chainring
what would make it this load?

1. Not a perfectly straight chainline
   
2. Cheap Chain
   
3. Too tight
   
4. A combination
   any advice on reducing this noise is gratefully received
   

chain lube! mmmm