Brain wave frequency and muscle tonus is decreased. Homotaurine has also shown anticonvulsant activities, reduction in skeletal muscle tonus, and hypothermic activity. Muscle tonus is dependent on neurological input into the muscle. The tonus peregrinus (or ninth tone) is associated with the ninth mode or Aeolian mode. For the "tonus peregrinus" in its customary usage for Psalm 113, see LU p. 160. The word tone derives from the Latin "tonus" (meaning "tension"). The corresponding Gregorian chants have a special tone ("tonus epistolae"). It is the only psalm traditionally chanted using Tonus peregrinus. Oncos Tonus, Gym fitness & bodybuilding and Lany's fashion house. Gaude Flore Virginali was recorded by The Sixteen in 1994, the Magnificat by Tonus Peregrinus. In a High Mass, it is chanted in a special tone (the "Tonus Evangelii"). Tonus is the Latin equivalent of the English word "tone".