Set the knobs on your equalizer to zero. Notice that the zero position of each knob points straight up. Play the recorded sound to hear it in its naturally recorded state.
Turn the lower frequency knobs counterclockwise to de-emphasize them. This thins out muffled sound or sound that has too much booming bass. Conversely, turning low frequency knobs clockwise accentuates the bass. This thickens audio or rounds it out.
Turn the highest frequency knobs counterclockwide to de-emphasize them. This reduces piercing or metallic sounds. Turning high frequency knobs clockwise accentuates these frequencies to round out muffled sounds. High frequencies also create punch in audio.