Double bass
In the simplest version, there are no mechanical aids attached                                                                             to the fingerboard extension except a locking nut for the "E" note. To play the extension notes, the player reaches back over the pegs to press the string to the fingerboard. The advantage of this "fingered" extension is that the player can adjust the intonation of all of the stopped notes on the extension, and there are no mechanical noises from metal keys and levers. The disadvantage of the "fingered" extension is that it can be hard to perform rapid alternations between low notes on the extension and notes on the regular fingerboard, such as a bassline that quickly alternates between "G" and the low "D".