Instead of using the generate solo's the way you are doing, as it seems to be causing some problems for you..Why ?? don't you just select the real track direct from the add realtrack dropdown menu when you click on soloist button.Generate the soloist part. Then use F5 to select the bars you require. Or take the BiaB file to RB and do it there section by section..Just a thought. The 127 instruments if I am right are all midi anyway.
You seem to be getting midi and realtrack confused somewhat.

Chris

Dell Optiplex i3 quad core,8gb mem,500gb
nvidia gtx750graphics,
Win10
ESI studio monitors
Presonus AudioBox iOne interface
Presonus Studio One 3
BiaB2014