Yes, I have the latest driver as well as the latest update to the Fantom, 2.1 IIRC. It's set to vendor. I'm pretty sure I would be getting audio to the computer if it wasn't. I suspect it may be a generic problem/challenge: On playback, Logic Pro send MIDI commands to the Fantom or any other MIDI device that has its own samples. The device generates the audio output and sends it via the USB cable back to the computer. Up to this point, it all works for me. As mentioned above, I use Audio HIjack to route the audio to the same output device being used by Logic Pro. Instead of using Audio Hijack, can I use Logic Pro to route the returned audio to its output device? Now that I think about it more, this might cause timing issues as a result of the round trip from the Fantom.