A chordic keyboard is one way to get more info from a small number of switches.
10 buttons = 2^10-1 = 1023 combinations.
USB numeric keypad?
http://diy3dprinting.blogspot.com.au/20 ... orded.html
I have seen twiddlers made from boxes and a few switches held in the palm with a strap that goes over the back of the hand.
You could do something like a power glove, finger flex/switches, tiny speaker for audio output and and Zero with USB power bank.
I2S DAC/AMP https://www.adafruit.com/product/3006
Plenty of sensors with breakout boards for motion detection.
Use hand tilt for shift type function chordic keys
All sorts of sensors these days.
Even a laser distance sensor, put one on a finger tip and you have whitecane.
There are people learning to echo sound from mouth clicks.
Would not an electronic sound generator be easier?
I have been wanting to make a body motion sensing suit for my kid, based on 9 axis motion sensors and SonicPi.
Trying to get him interested in music. dance and some exercise
I'm dancing on Rainbows.
Raspberries are not Apples or Oranges