Had a bit more of a look last night and its definitely the alternator. I removed the belt and ran it for a few seconds and the noise was gone. All the idler pulleys felt ok, put the belt back on and check the charge voltage and it was only sitting at 12.8 at idle. it would get up to 13.5 with a few revs but as soon as turned the lights on the volt would drop.
I unplugged the connector on the back of the alternator and the noise went away. Mine sounded very similar to the youtube vid posted above. I wouldn't rule out the idler pulleys but id check out your alternator.
Hope this is of some help.
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