Quantity   Component name
1 × Arduino UNO
2 × Sparkfun CD74HC4067 analog MUX For connecting to UNO I've used i2c expander.
1 × Sparkfun MP3 Shield This was required for project to play with pre-rendered samples as standalone device The project itself can be easily fixed for MIDI purpose.
32 × CNY70 IR Sensor Or any other sensor that can react to something placed on
8 × White LED Connected with shift register