I have always used stage traxx3 on my iPad but recently purchased stagetraxx 3 on my MacBook. no matter how I try ive followed all threads and info about this the songs will not change key. With ST2 it was instant and I never had an issue is there any advice how to do this please. I have all relevant things selected but the songs will not change and there's no indication that they have been altered. please help its driving me mad. thanks in advance