One key on my piano feels spongy and sounds weak. Whats wrong?
You have given a classic description of the problems created by a broken key. To technicians, the term “broken key” doesn’t simply mean that the note doesn’t work. It means that the wooden key lever you play with your fingers is split at its fulcrum. As you play the key, it bends, causing the sponginess you noticed. Naturally, the force you apply to the key is somewhat dissipated by this bending, so the resulting sound is weaker than it should be. If left unattended, this split will grow until the key is broken in half. The proper corrective procedure involves not only gluing the split together but reinforcing the area of the break with hardwood veneer. It would be wise to have your technician make this repair for you, as even a small error may cause sticking, clicking, or other problems with this key in the future.
