how finished will your song be? the reason i ask is that once you've done everything in BIAB - leaving the count in the same and with no need for further editing, if you open the BIAB file in Realband you can edit the file any way you choose.

I'm assuming you get the count in for two bars and then the pick up is on beat 4 of bar 3 with silence on beats 1,2 and 3.

delete bar 2 on all tracks so bar three become bar 2, and then copy and paste the first three count in beats from bar one to the new bar two before the pick up beat.

should work! but don't forget you can still regenerate and mix and edit in RB so its not a once and for all decision.

maybe its possible in BIAB but i'm so used to doing anything a little confusing in BIAB in RB because its obvious and much easier.

I must admit when i had this issue singing live i just sang over the fourth beat in bar 2!