I am using an old Sony deck (GV-D300) as well but I know that it is not due to that because I use that same deck with FCP and shuttling is fine. This shuttle problem even occurs when I try using my camera as a deck. I am using firewire which is also what I use for FCP. I just don’t understand why this same meathod which works so perfectly for me on FCP is so bad on avid.