Help - e53 Knocking from transmission - VIDEO

[SMOKEY53]

Hi guys

hoping someone can help with some internet diagnosis as it's a public holiday here and no mechanics open.....

This sound has crept up on me in the last 24 hours.....

It's present from about 20 seconds from start up, in all gears, and including when driving or rolling in neutral.

I have run BMW Scan 1.4.0 and no codes present

Using a garden hose and a screw driver as a listening device, it's not coming from the top end, not coming from the block - but I can hear it clearly through the transmission mounting point and it's coming directly out of the inspection hole under the transmission (which is where the first video is shot from)

Torque converter, flex plate, flywheel......I'm at a loss?

http://vid16.photobucket.com/albums/...ps11s0verf.mp4

This second vid shows the sound settling in soon after startup, it increases with a rev and then dies off after the revs return to idle but quickly comes back.

http://vid16.photobucket.com/albums/...pszxlgfvjz.mp4

Any help much apppreciated