Amazon.com: MeloAudio 2 in 1 Cable Male to Female USB OTG Adapter to Charging Extension Cable Compatible with Piano Microphone Audio Interface Keyboard : Electronics
Amazon.com: LMUBOY Lightning to USB-B Midi Cable for iPad/iPhone,USB Type B Midi Cord for iPad/iPhone Work with Electronic Music Instrument/Piano/Midi Keyboard/Recording Audio Interface/Organ Drum/USB Microphone : Musical Instruments
EU Warns Apple About Limiting Speeds of Uncertified USB-C Cables for iPhones - MacRumors
USB Type B to Midi Cable, USB OTG Cable 2.0 iOS Devices Compatible with Select iPhone,Midi Controller, Electronic Music Instrument, Midi Keyboard, Recording Audio Interface, USB Microphone - Walmart.com
TASCAM Series 102i USB Audio Interface with Cable for iPhone/iPad (Lightning Compatible) : Musical Instruments - Amazon.co.jp
Yamaha 4.9' USB to Apple 30-Pin MIDI Interface Cable I-UX1 B&H
How to connect a USB audio interface to an iPad/iPhone - YouTube
Apple to put USB-C connectors in iPhones to comply with EU rules | iPhone | The Guardian
CD-IU51V - iPod®/iPhone® USB Interface Cable for Receivers with High Current USB Port (Audio and Video) | Pioneer of Canada - English