My nephews who are 8 years old asked me to program a simple instrument for them to fiddle around. This was my suggestion, a combination of Pure Data’s recycled wavetable synth which allows changing the timbre by just drawing. Pitch is controlled by the keys. Press and jam! If you need an English manual instead of the German one, please let me know.
Please make sure you have ezdac~ and synthclaco installed in the same directory, so PD can access them.