Loudness normalization adjusts the recording based on perceived loudness. There are many different qualities in sound stimuli including loudness, pitch and timbre. Both amplifier power and speaker sensitivity affect the maximum realizable loudness. Pitch is a major auditory attribute of musical tones, along with duration, loudness, and timbre. They are&colon; pitch, duration, loudness, timbre, sonic texture and spatial location. The mute changes both the loudness and the timbre ("tone colour") of a violin. Such sensitivity requires less amplifier power to achieve the same loudness. Prosody includes auditory characteristics such as pitch, speech rate, duration, and loudness. Doubling the perceived loudness doubles the sone value. Unfortunately, this has the effect of modulating the loudness of the sound as well. RMS power accounts for the signal's physical level, EBU3341 loudness for the perceived level. Unfortunately the peak level reading does not correlate well with the perceived loudness. The compressor and limiters are ways of controlling the loudness of a track. The participants listen to the tones which will vary in pitch and loudness. An increase of 10dBs results in a perceived doubling of loudness.