Quantity   Component name
1 × Arduino Mega Chosen for it's plentiful Analog pins. Could easily be a smaller arduino with analog expanders
4 × DFRduino MP3Player Each handling sound playing for each pad
1 × Panelmount DC barrel socket to pass power to the Arduino
1 × Enclosure - TBC Big enough to hold your boards and allow for mounting jacks, screen, encoder, pots & power
4 × Micro SD Card For storing dem sweet sounds! 1 per MP3Player board. Small capacities will do.
4 × Stereo 10K potentiometer For level control on the MP3Player outs
8 × 1k Resistors Used with Pots to create voltage dividers to mix the 4 stereo outputs to 1 stereo output.
6 × TRS Jack sockets for connecting the pads (main, rim and ground connections) and outputs
1 × i2c 16x2 LCD Display For volume and Sample group number display
1 × Rotary encoder w/push button for setting and selecting volume and sample group number
1 × Panelmount USB port to extend the USB port on the Arduino