You retrieve it from wherever you put it. If you initialise like this…
self.coreAudio = [MyAwesomeCoreAudioController new];
self.streaming = [[SPTAudioStreamingController alloc]
initWithCompanyName:@"DanCorp"
appName:@"MyApp"
audioController:self.coreAudio];
…you can access it with self.coreAudio
.