On Jeff Beck's Black Cat Moan Live, how is he getting that effect? TO me, it almost sounds like he is running an envelope filter and using a wah to emphasize.
Any ideas?

Talk box.
Beck used a Kustom "The Bag"

Thanks. I can;t beleieve that never crossed my mind I have been lsitening to it in my car for about a week and kept trying to figure it out. I don't recall hearing one used the way he does on that tune.
Thanks for the tip, tiem to dismantle my fish tank for some tubing