Samson Carbon 49 USB MIDI Controller Samson's Carbon 49 USB MIDI Controller was designed to make musical performance and production accessible to everyone. For seasoned musicians and young creators alike, the Carbon 49 offers versatile, yet easy-to-use features in a compact, lightweight controller that's well-suited both stage use and in the studio. It offers you a semi-weighted keyboard comparable in feel to that of pro-level instruments. Its 49 velocity-sensitive keys allow you to accurately capture the full dynamics of a performance. In addition, the Carbon 49's dedicated Transpose and Octave buttons, as well as its classic Pitch Bend and Modulation wheels, allow you to expand the keyboard and enhance your overall musical expression.