Default value
0
Any value from -100 to 100 will play this sound at a multiple of its normal frequency. Set to 2 to play at double speed, for example, or -1 to play backwards. A value of 0 or 1 will play the sound at its normal frequency.
Set to a specific frequency (in Hz) outside of the -100 to 100 range to change the playback rate of the sound. A negative value is also allowed. The value 0 means that the sound should be played as-is. This value will take effect when the sound is sent to a player.
CD-quality sound is sampled at 44.1 KHz, which is a value of 44100. Other common sample rates for .wav files are 8000, 11025, and 22050. (11025 is usually a good quality for most sound effects without making file size too large.) If you know the file’s sample rate, doubling the value will play it at a higher pitch and twice as fast; halving it will play it at a lower pitch and twice as slow.
To make a sound play at a different speed but keep its pitch intact, set frequency to the speed multiple you want (e.g., 1.2 for 20% faster) and set pitch to the inverse (e.g., 1/1.2).