This is why I use the Realband route to get audio from BIAB to Sonar, safer, easier and for multi tracks perhaps just a tad quicker. Even though it may seem not to be. I did a timing once for a song - 4 audio parts via the drag and drop -v- RB method. RB method was about 8 seconds quicker smile

Further, it seems that when "dragging" from BIAB direct to Sonar, BIAB re-generates a part (even if freeze is on) whereas I have found RB generally loads in the tune as created and saved in BIAB.

Not saying your way is wrong (far from it) just saying is all smile