I can use Realband with PowerTracks, I can open in PowerTracks an SEQ made in Realband or a UserTrack and simply highlight the bar/s of a chord/s and drag the Audio/Midi straight into Realband.

(Just change the default out of the temp root in your Audio Settings first to:
RB
AppData/Local/Temp/Realband

PT
AppData/Local/Temp/PowerTracks)