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The joyMIDI is a portable 4 in 1 MIDI controller, there are 4 operating modes in it, Keyboard(MIDI), DrumPad(MIDI), DJ(MIDI) and GamePad(HID-joystick). Which the case is 3D print (open source on Onshape ). Support for smartphone, tablet and PC.
After power-on press the right button to enter the DJ controller mode.