Mitch from TheAudioDabbler bring us a well illustrated demonstration of some of problems still plaguing MIDI on iOS. Here he's specifically showing off some really weird sync issues.
The many woes of Midi Sync issues on iOS. I go through getting Sector to clock sync and still have Ableton Link.
Patreon Link(if your into that sort of thing)
iConnectAudio4+ for Sound routing
Audio Record with Zoom H4nPro
Edited in Final Cut Pro