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The maximum number of Inter-App Audio connections depends on the device. Connections are severed without notice by iOS in low memory situations.
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Connection sometimes fails if the node app is already running due to a bug in iOS. As a rule of thumb, quit all audio apps, launch Cubasis and then connect Inter-App Audio nodes. Don't launch node apps manually before launching Cubasis.
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Connected node apps don't always appear in the app switcher. This is an iOS issue which can lead to connections failing. As a workaround, launch the node app manually from the home screen, then open the app switcher and swipe up to quit it.
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Cubasis can only interact with node apps via Inter-App Audio; it cannot be selected as an input in another host app.
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Inter-App Audio routing performs best with a sample rate of 44.1 kHz. Other values might lead to crackling noise.
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Even if an app is listed multiple times, only a single connection can be made to it at a time.