Audiobus has three different modes: Audio, MIDI, and the Mixer. The default mode is audio. Audiobus sessions are set up by adding compatible apps to the main screen.
There are three positions that apps can be placed in, which allow you to create a pipeline of apps.
Input apps are a source of audio or MIDI.
Example source apps include SoundPrism Pro, Sunrizer, FunkBox and Figure.
Effect apps manipulate audio or MIDI.
Example effect apps include Echo Pad, JamUp Pro and Crystalline.
Output apps receive audio or MIDI.
Example destination apps include Loopy HD, MultiTrack DAW and GarageBand.
Some apps can be used in multiple positions, which means they can be an input, an effect or an output. Furthermore most audio input apps can also be MIDI receivers.
Tap a "+" button to add an app in one of the positions. A list of all compatible apps will be shown: Tap one to select it.
Once you add an app to a slot, Audiobus 3 will try to load it. Apps that have not been optimized for Audiobus 3 will require you to manually launch them with a tap and Audiobus will prompt you to launch them into the foreground by displaying a 'Tap to Launch' label on top of the app icon. iOS will switch back to Audiobus once they're launched.
All other apps and Audio Unit Extensions will be launched into the background with no further interaction required. You can find new Audio Unit Extensions and apps that have been optimized for Audiobus 3 in the compatible apps directory, which is accessible by tapping on 'APPS' in the top left corner of the main screen.
If you don't own an app yet but it appears in your setup after you've downloaded a preset from another Audiobus user, the label will read 'Tap for App Store'. Tapping will then open up the App Store where you can purchase or download the app.
Afterwards, you can tap the app icon any time to switch to it.
Once all apps in a pipeline have been launched successfully, an active Audiobus connection is indicated by an animating lightstrip beside the connections.
The Audiobus Mic and Speaker
Audiobus provides a speaker destination and microphone source. The microphone source also works with audio input accessories.
The Audiobus microphone source can also come in handy if you want to record the live audio input as well as the output from another app. Audiobus will mix the audio together seamlessly.
Audiobus supports input from class compliant multi-channel audio interfaces. Depending on the audio interface, you may need a camera connection kit and a powered USB hub to use it with your iOS device.
When Audiobus recognizes a compatible multi-channel audio interface, a blue disclosure indicator will appear on the System Audio Input item. Tap this to select individual channels or channel combinations.