Apps like USBMIDIConnect

Here are some great alternatives to USBMIDIConnect by David W Stone :
Audio Evolution Mobile Studio
Audio Evolution Mobile Studio
★4.4
Piano MIDI Bluetooth USB
Piano MIDI Bluetooth USB
★4.5
USB Midi Visualizer
USB Midi Visualizer
★3.7
SoundFont-MidiPlayer-Piano
SoundFont-MidiPlayer-Piano
★4.1
Link to MIDI Bridge
Link to MIDI Bridge
★5.0
Rockrelay Synth FM
Rockrelay Synth FM
★4.1
MIDI App ( trial version )
MIDI App ( trial version )
★3.6
Melodi MIDI Controller
Melodi MIDI Controller
★3.9
Midi Commander
Midi Commander
★3.3
MIDI Drum
MIDI Drum
★4.6
MIDI Keyboard
MIDI Keyboard
★3.6
MIDI Connector - RTP, USB, BLE
MIDI Connector - RTP, USB, BLE
★3.3
MIDI Controller
MIDI Controller
★3.7
FluidSynth MIDI Synthesizer
FluidSynth MIDI Synthesizer
★4.1
Note Teacher
Note Teacher
★4.4
Bluino Loader - Arduino IDE
Bluino Loader - Arduino IDE
★3.7