I have Logic Pro (GB's big bro) and I frequently use Biab tracks in it to access their loops. You can transpose their midi with great success , but audio loops only transposes so far before it sounds bad . Now that Biab has loop-ability in 2012 you may not need GB to get all loopie ! If I had to choose one it would be Biab as the hands down winner ,would not even be a contest for me!