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To my knowledge there aren't any circulating yet. I plan on picking up a pair when I sell a couple of other pieces. Aaronj made a cople of recordings at Jam with 2006c the omni version. They can be found here.http://taperssection.com/index.php?topic=154550.0
That said, if you're familiar with the 4021/4022/4023 sound, these use the same capsule. The basic jist is that it's the amplifier body that changed and now the capsule is removable. Sonically they will be very very similar (at least enough to base a spending decision on).