I suppose you could just freeze the whole track/s then when you select the Regenerate Selected Bar/s button it will pop a window up with:
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This will un-freeze the selected section of selected track/s and re-generate with a new section.
Enter start bar[13 ] end bar[16] (will get automatically if selected)
Select Track/s
[  ] All Tracks Selected Bars
[  ] RealBass 684: Bass, Electric, PopHalfNotesSync Ev 120
[  ] RealDrums-RockHardEven8^1-HiHat,Ride
[●] RealPiano 522: Guitar, Acoustic, Fingerpicking Ev 120
[  ] RealGuitar 1119: Guitar, 12-String Acoustic, Strumming Ev
[●] RealStrings 408: Guitar, Resonator, Background Allis Ev 1

OK Cancel
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If they are going to have issues generating up 7 new track sections maybe they can call on bbw4 and get the data from that then overwrite the bar/s with the new data ?