I'm using a Mits-2000 D-VHS via firewire. It only seems to work if the 6412 and 2000 are not connected to anything else via firewire. I have to swap the firewire cable to either my t-165 or 3410a to get playback.
Recording procedure is fairly straight forward, however, you have to be there to get it started.
With the recorder prepared, (blank tape in, tuner set to d) set 6412 to station you wish to record, or, initiate playback of whatever from hdd, then press record on D-VHS.
I have no way of monitoring the recording until it's done.
I get OPBHD at 90.60 on my 3410a. There's a ton more digital music on 90.whatever so I dumped 90. from my list. If I want OPBHD from cable I just punch-in 90.60.
What I mentioned fit with ease, but I didn't mention all the rest of the stuff that was already on the hdd or what I had scheduled coming up. There's really not enough time to watch all this stuff. "Lucy, you got some deleting to do!"