Strauss's output of works for solo instrument or instruments with orchestra was fairly extensive. A cymbal is a common percussion instrument. The instrument is both a wind instrument and percussion instrument. These refer to the notes of a flute, which was the only fixed frequency instrument. The chorus is led by a synth flute similar to the Japanese shakuhachi instrument. The electroscope was the first electrical measuring instrument. The modern clarinet developed from a Baroque instrument called the chalumeau. Grebenshchikov himself played a small keyboard instrument. This technique allows retrieval of signals below the nominal detection threshold of an instrument. The national musical instrument is the cuatro. It is a string instrument or chordophone. Murli is a typical folk musical instrument. It can be produced by a mass spectrometer instrument. Sabah is known for its traditional musical instrument, the sompoton. Another is the Percussive Harmonic Instrument (PHI).