mbed midi controller feasibility
The mbed will have to run to some sort of usb hub that can "route" the signal to the correct endpoint: android ADK -> mbed to change midi function (lower timing priority), mbed -> host pc to transmit the data (higher timing priority).


Unfortunaltely, this is not possible with the LPC1768: the USB must be in Host Mode for the Android ADK, but in Device Mode for the PC connection. But there is only one USB peripherial on the LPC1768 - it can work in either mode but not both at once.

It might work with the bigger brother, the LPC18xx from NXP - some variants have two USB units.