love ezkeys - if you want to make up keys for a band in a box song just go into preferences and there is a chord output setting - you turn it on then save as a midi then just split the chord output track to a single midi track file and save
now load it into ezkeys and you will have your chord track
you can now split it into section with the scissors
select the clip now click on browser midi and select one that fits
and click replace if you like it
hope this helps

Biab Track Injector for Reaper
Free Biab Chord Picker Tool