BoomMP3 Box Sound and Music Controllers - Components You can buy our MP3 Controller board and embed it in your custom enclosure or animatronic to deliver sound and music to visitors of your display. You can also buy the MP3 Controller board with optional digital input/output capabilities. This is the MP3 Controller board ready for installation in your custom enclosure, animatronic, or other device. MP3$299.95 This is the daughter board on the older MPC-MP3 Controller for reading digital input/output signals. Limited number available. MP3-IO$99.95