Prototype
Here’s the working hardware prototype. Unit on the left is the receiver (Xbee on Sparkfun Xbee breakout board + de-chipped Arduino) and the right one is the one of transmitters(Xbee on Xbee Lilypad breakout board). Receiver must be physically connected to the computer for data bridge. Receivers will work wirelessly on battery.
During my research, I found out that Xbee can operate standalone, transmit or receive data through 6 I/O pins. So I don’t have to use any microcontroller. Thanks to Dan Shiffman and Rob Faludi for Xbee Processing API, I managed to gather accelerometer data correctly (but needs noise filtering) and send to Ableton Live as MIDI signal. Next move is fine tuning.