Interactive Guitar Lesson (poster by Max Dalton). Pressing the button underneath a guitarist will play various short guitar riffs by the guitarist, while a long press will play an extended solo. A volume knob and speed knob are also included. The speed knob can be used to change the playback speed, slowing the rate of the audio without changing the pitch. This allows for easier learning of the riffs and solos by ear. A quiz mode is also available where a riff or solo is played and the guitarist must be guessed.