Automate volume changes in GarageBand for iPhone - Apple Support
MIDI files in GarageBand iOS | How to download and import (iPad/iPhone) - YouTube
Use the Beat Sequencer in GarageBand for iPhone - Apple Support
Play the Keyboard in GarageBand for iPhone - Apple Support
How to reverse a track in GarageBand on Mac and iOS
IK Multimedia - iRig Pads
TIP: How to add arrangement markers to GarageBand iOS. I found a work-around by creating blank midi regions and naming each of those regions. See screenshot example. : r/GarageBand
How To Connect MIDI Controller to Garageband iOS – Producer Society
Use the Audio Recorder in GarageBand for iPhone - Apple Support (MT)