Sound test with accelometer data transmitted by RF via stamp to Max/Msp. I do the A/D conversion from the accelometer with RC pair which is bit crap resolution, so I get only few peak and change values in to Max. I'll try this with decent ADC later. Lag is ok, feels like playing. The lag in the video seems longer.
video: couple of meters
I have stamp reading the accelometer and transmitting via the 433Mhz RF chip, which is complete overkill, but it'll do for prototyping. You can make it very small with small pic and smaller RF but even this would fit inside tennis ball. The range is tens of meter indoors.
The breadboard on the left has the receiver with stamp.