![]() ![]() The center pedal is the sustain or sustenuto pedal which disengages the dampers. It shifts the keyboard beneath the strings so that the hammers strike fewer strings, giving a softer sound. The left pedal is the "soft pedal" or una corda. Three pedals afford the player some control over the sound of the instrument. The soundboard is usually made of spruce. Energy is coupled from the strings into the soundboard and from it into the air. ![]() The soundboard is a crucial element in the sound of the piano. Held in a heavy cast iron frame, the strings pass over a bridge to a pin block by which the strings are tuned. The strings are sounded by hammer mechanisms which are activated by the keys. The piano has 88 keys which span the frequency range 27.5 Hz (A0) to 4186 Hz (C8). The relatively soft hammer structure, fashioned from pressurized wool, gives a dramatic attack to the tone without sounding harsh. This baby grand is one of several configurations of the piano. ![]()
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