JACK for iOS: Audio and MIDI Between Apps
"It’s free – no cost to download on iOS, and based on the free and open source JACK on Mac, Windows, and Linux. […] It does, its developers say, everything: audio, MIDI, sync, and data sharing in any arbitrary combination you like."
JACK on iOS is a good addition. I want to see it being adopted by developers, though I see it’s going to be unlikely that it will spread as fast and wide as Audiobus. Main reason is not because it’s better, per se, but because it costs money. There’s something subliminal going on when cash is involved.