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I would check the harmonic damper (main crankshaft pulley). When the rubber fails, they can make a 'ding ding ding' metallic noise.
With the ancillary belt removed, check if there is any play between ...
This sounds nothing like a knock to me, or anything internal to the engine. It appears to be running really well from what I can hear. It sounds like you have an exhaust leak. You need to scour the ...