Assertion: pedal's sound | /r/HasProperty | produced
Facets:
value: usually
type: DEGREE
value: due to the felt
type: CAUSE
Source sentences:
text: Tone quality is also affected by forcing the remaining two strings being struck to make contact with a part of the hammer felt which is not often hit (due to the whole action being shifted); this results in a duller sound, as opposed to the bright sound which is usually produced (due to the felt being hardened from regular use).
text: The effect is thereby enhanced because sounds are produced from multiple locations in the stereo field.
text: This pedal sustains but does not increase the power of the sound that is produced.