Things move so quickly with IOS that AudioBus3 is old school, and now the big deal is AUv3. AudioBus3 is limited in comparison with AUv3. Both Camelot Pro and Key Stage can host multiple AUv3 apps. Watch this guy the author of Key Stage app giving a demo; all IOS sounds.

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"You Shall Know the Truth, and the Truth will set you free." John 8:32