Originally Posted By: beatmaster
transpose by octave in the piano roll.. Sorry but how do you do this ?.

So if you import the exported chord track midi to Melody track in BB, you Melody > Edit Melody Track > Transpose so the chords are within C6-C7 range.
The notes below C6 are the keyswitch notes to select different patterns as in the animated gif above.

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BB-Midi-Chord-Track-Transpose.png (83.17 KB, 56 downloads)
BB-IRON-Chord&Keyswitch-Notes.png (387.55 KB, 55 downloads)