MIDI Wrench

Free MIDI diagnostic tool that lists connected devices and visualizes real-time MIDI messages.

iOSApp Store (US)★ 4.7 · 71 ratingsfree

A free diagnostic utility for iOS that lists every connected CoreMIDI device and virtual port, visualizes incoming MIDI messages in real time, and can send test Note-On/Off and Control Change messages, helping musicians debug problems in a MIDI hardware or software setup.

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