The two sides produce sounds of different pitch and tone.

Pitchers use different pitches to try to get the batter out.

In the process, she learned how to throw different pitches.

And later in his career, he could hurt you with several different pitches.

Men, women, and children generally produce voices having different pitch.

It has eight keys, which allows for the playing of nine different pitches.

My next at bat he threw me the same spot but a different pitch.

In the example the numbers refer to the different pitches being played.

Each pair will make a sound of a slightly different pitch.

Though it may be that many of these sounds are the same sound delivered at a different pitch.