We're trying to connect a Sony J-30 VTR to a unibody MBP. The VTR has a standard 6-pin FW400 port on the back, we're using a FW800>400 adapter cable... and the MBP just will not see the VTR at all. Using an external FW800 HD, we've confirmed that the MBP's FW800 port and cable work. All of Apple's official documentation for FW800 says that with an adapter cable you get "seamless" support of legacy FW400 devices, but it just ain't happening. We've tried three different J-30s, all with no result. All of the VTRs work perfectly when connected to a FW400 port on an older MBP. Are there any hidden FW config options within OS X or FCP that we could try?