Quantity   Component name
1 × Teensy 3.1 (or 3.2) http://store.hackaday.com/products/teensy-3-2
1 × Teensy Audio Board http://store.hackaday.com/products/teensy-3-2
1 × Drum Master PCB
1 × HD44780 Display
1 × Rotary encoder with push button
1 × A bunch of electronics parts (See schematic for details)
1 × Drum pads with sensors (See logs for details)