PSA: Don't update to iOS 12.4 if you use apps in AB output slot or IAA apps that use the mic.
https://forum.audiob.us/discussion/34030/urgent-psa-hold-off-updating-to-ios-12-4-if-you-use-apps-in-output-slot-in-audiobus

Casio app

https://itunes.apple.com/gb/app/chordana-viewer/id711042441?mt=8

There's also a free version.

Haven't figured it all out yet,but looks like it could be handy

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