The fast forward, backward, and accelerated playback of music are changes in frequency, and the increase or decrease in volume is a change in amplitude.

The human ear’s perception of the pitch of a sound is called pitch. Pitch is primarily related to the frequency of sound waves. The higher the frequency of the sound wave, the higher the pitch. The human ear's subjective perception of the strength of a sound is called loudness. Loudness is related to the amplitude of sound wave vibrations. Generally speaking, the greater the amplitude of sound wave vibration, the greater the loudness.

Amplitude and frequency are two different concepts to describe fluctuations. There is no obvious connection between them. The frequency determines the pitch, and the amplitude determines the energy.