With the USB MIDI BRIDGE WITHOUT PC,NO driver:
  - Start the application
  - Connect the instrument that receives midi information (so that emits sounds) first midi IN with a commercial DIN to USB and then allow access to the USB OTG
  - Then connect the midi device (eg USB EWI) and allow access to the USB OTG
Select the MIDI channel and play .... !! simply. Enjoy your midi controller without PC

Tested together: HUB USB + Cable OTG
  - With a phone Galaxy Note 2 PSR 8000 + with USB / MIDI (Yamaha) + EWI USB interface (no latency !!)
  - With a phone Galaxy Note 2 PSR 8000 + with USB / MIDI (Yamaha) + YOUR GUITAR HERO interface (no latency !!)