Sound source, keyboard musical instrument, and method for generating sound signal

A keyboard musical instrument comprising:

• a detecting device that detects passage of a key through a first position, a second position, and a third position within a range of depression of the key;
• a sound source comprising:
• a memory storing instructions;
• and
• a processor that implements the instructions to execute a plurality of tasks, including:
• a first calculating task that calculates a first estimated value based on a detection result yielded by the detecting device, the first estimated value pertaining to behavior of the key at a predetermined position within the range of depression, the second position being deeper than the first position, the third position being deeper than the second position;
• a second calculating task that calculates a second estimated value based on the detection result, the second estimated value pertaining to behavior of the key at a fourth position that is deeper than the third position;
• a signal generating task that generates a first sound signal and a second sound signal based on the detection result;
• a first adjusting task that adjusts an output level of the first sound signal based on the first estimated value;
• and
• a second adjusting task that adjusts an output level of the second sound signal based on the second estimated value,
• wherein the first sound signal and the second sound signal represent different sound waveforms, and
• wherein the output level of each of the first sound signal and the second sound signal is a sound volume.

A method of generating sound signal comprising:

• calculating a first estimated value based on a detection result yielded by a detecting device that detects passage of a key through a first position, a second position, and a third position within a range of depression of the key, the first estimated value pertaining to behavior of the key at a predetermined position within the range of depression, the second position being deeper than the first position, the third position being deeper than the second position;
• calculating a second estimated value based on the detection result, the second estimated value pertaining to behavior of the key at a fourth position that is deeper than the third position;
• setting an amplification factor of a first sound signal based on the first estimated value and an amplification factor of a second sound signal based on the second estimated value;
• and
• outputting a signal for starting generation of the first and second sound signals that are to be amplified according to the respective amplification factors,
• wherein the first sound signal and the second sound signal represent different sound waveforms, and
• wherein the amplification factor of each of the first sound signal and the second sound signal is a sound volume.