This video documents a hack that turns a Stylophone into a basic MIDI controller, and using it to control Propellerheads Reason.
Details on the hack available at Jason Hotchkiss’ site.
The technicals… Soldered wires to Stylophone PCB to use its keypad / resistor ladder.. put 5V across it and read voltage at stylus by analog input pin on arduino clone (miduino).
Found out input value for each note and sent out MIDI note on/off messages thru serial connection when notes are detected. Simple.
Used Propellerheads reason to make the sounds.