Sadly, the release version of iOS 7 has some new audio bugs that were not in the beta versions. This has broken the CMI Apps in iOS 7. The Audiobus guys are saying that serious musicians should NOT upgrade to iOS 7 yet because it has too many audio bugs.
The symptoms in release 1.5.4 and earlier are that most of the voices are silent, and there is an error trying to connect to Audiobus.
CMI release 1.5.5 has fixes for these bugs, and is in the App Store waiting for approval.
In the meantime, enjoy the “LOCUST” sample song– it just happens to have voices that all work in iOS 7.
Posted in: Bugs Fixed in 1.5 to 1.6