from The Century Dictionary and Cyclopedia
- n. In the pianoforte, the pedal which raises all the dampers from the strings, so that the vibration of the strings can be prolonged after the finger has left the key, and so that other strings besides those struck may be drawn into sympathetic vibration. Sometimes called loud pedal.
Sorry, no etymologies found.
If it persists longer than 2-1/4 or 2-1/3 seconds the room will not be suitable for musical performances because of the mixture of persisting tones with following ones, this causing a blurred effect somewhat like that obtained by playing a series of unrelated chords on the piano while the damper-pedal is held down.