I hate to revive such an old thread, but I couldn't help but ask about the same problem...
I've been trying to figure out if I'm routing correctly to the 308 from my 38 deck. First of all, I don't really understand the tape input section other than sending the output of the tape deck back to the mixer for playback. This is the only obvious. I have a 1/4" to RCA snake going from the direct outs of channels 1-8 into the inputs 1-8 on the tape deck. I can get the direct audio to tape. Now, as the OP stated, if I don't remove the patch cord from the D-OUT plug on the channel I recorded from when playing back, I cannot hear it unless I am using the tape input section to monitor it. Using this section sounds like ass! But if I unplug the instrument from the channel it plays back perfectly. I can then mix and pan and whatever right from the channel. The question is, why the hell do I have to remove the instrument cable from the mixer to playback and use the channel controls? I thought you could just disable the line-in but that didn't seem to work... I mean, this setup would be fine in a temporary situation but not when you want to keep all your equipment plugged in to the mixer at all times (I primarily record keyboards and like to have the option of leaving them on dedicated channels and then be able to record instantly if I want to).
The other question was about the phantom power situation. I would hope that by using another mixer that has phantom power on the channels I would be able to interface that with the 308, right? I haven't even tried it yet, I just thought it would make sense before I have to run out and buy a phantom power amp or something...