Amazon.com: IK Multimedia iRig Keys I/O 25-keys Midi Controller with 24-bit up to 96kHz Audio Interface for iPhone/iPad, Android and Mac/PC : Everything Else
Android Phone Midi Controller - YouTube
Using a MIDI controller with Caustic 2.1 on Android - YouTube
Android MIDI Controller
Pedalino open source wireless MIDI foot controller with iOS and Android app - Geeky Gadgets
Free Android MIDI Music Making Apps — iConnectivity
Dawvelopment releases "DAW IT" MIDI Controller App for Android
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LK - Live Controller, iPad and Android Controller for Ableton & MIDI H : Ask.Audio