If the Aeros part you have selected while stopped is empty, you can make the Aeros enter a scrolling mode, I have never seen someone use the scrolling mode without recording in it however. I do not know if there is an issue with that approach definitely let us know, as this is not the typical usage for Aeros! So plenty to learn 
The CC for Aeros and BB changing parts is coordinated! CC113 value 1-32 starts the BB part transition and CC113 value 1-6 selects the Aeros song part while stopped or starts the transition if playing back. To start the Aeros from stopped with a part change, you would need a CC113 value 101-106 command that is specifically for this. BB will not ignore these in v3.8.0 but it is filtered as of beta 3.9.0.