I’m using ipad2, ios7 with 5G of free space, 44 hz. Audiobus set to 512. All apps closed. Not using any plug-ins and no fx. After a percussion track, keyboard and 2 rhtymn guitars plugged directly, the problems start. I also don’t have the problem with Garageband; I’ve recorded up to 10 tracks and no problems. If this issue can be resolved Cubasis can be a great app. Till then I can’t use it for more than 2 or 3 tracks.