Read Assert, Precondition and Fatal Error in Swift - Five Ways to Fail.

Read Reducing Memory Footprint and OOM Terminations in iOS. One more reminder to use UIGraphicsRenderer instead of UIImage(named:). Quite detailed post with references to some example projects on GitHub and to appropriate WWDC sessions.

Read Why iOS developers should pay attention to Flutter in 2019. Not convincing.

Run through Building a MIDI Sequence in Swift accustoming myself to AudioKit and Midi. Too much over-complicate for simple task of playing generated on a fly MIDI.

Passed over Building a MIDI Music App for iOS in Swift. It is better because it doesn’t depend on third party frameworks. Unfortunately it depends on deprecated APIs.

What is MIDI? Finally I came to this question. Answer is concise.

Watched WWDC 2019 Session 509 video What’s New in AVAudioEngine. Nothing relevant for me at the moment.