here you can see and listen to a little example showing the odroid and his excellent software MIDI capabilities.
My playing piano is really a nightmare but it shell demonstrate how fast the ODROID-C1 can be with 3 different MIDI devices connected to it via I2C/WiFi/USB serial connection.
ODROID-C1 <-> Arduino UNO with 18 paperclips: USB cable
ODROID-C1 <-> 4 x MPR121 (Touch Sensors): I2C
ODROID-C1 -> USB soundcard (very cheap): plugged into one of the USB ports
ODROID-C1 <-> Android Tablet: WiFi
Software running on the ODROID-C1:
connecting the hardware to the synth
ttymidi (serial connection to Arduino)
multimidicast ( WiFi connection to Tablet)
and the producers of metal paperclips, of course.