Hi, I would start with the simple solution which "should" work since it works for me, but since you have a different set-up it might need some extra tweaks. Of course there are some workarounds depending on what "drives" what in the chain, but with: Keyboard MIDI out to PT MIDI in, PT MIDI out to HUI MIDI in, HUI MIDI out to Keyboard MIDI in. You should be able to record MIDI from KB to PT, play MIDI from PT to KB and/or HUI and from HUI to PT.