Hey there,
This is not possible on version 5.0.3 but is possible on beta 5.1.0!
As of 5.0.3. if you tap the Play / Stop All button while a quantized song is stopped and in an empty part, the Aeros will start to scroll. In 5.1.0 we added a setting to send the Start command when scrolling begins, allowing you to start the Digitrack while the Aeros begins to scroll and then you can record the Aeros at the next measure.
Let me know if this works for you thanks for the question!