# Adjust the sound effect without playing the sound

**URL:** <https://qa.fmod.com/t/adjust-the-sound-effect-without-playing-the-sound/19186>\
**Category:** FMOD Engine\
**Tags:** cpp\
**Created:** [August 25, 2022, 1:31pm UTC](https://qa.fmod.com/t/adjust-the-sound-effect-without-playing-the-sound/19186 "2022-08-25T13:31:19Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![jeff\_fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/jeff_fmod/32/1766_2.png) [@jeff\_fmod](https://qa.fmod.com/u/jeff_fmod)\
**Post date:** [August 29, 2022, 2:15am UTC](https://qa.fmod.com/t/adjust-the-sound-effect-without-playing-the-sound/19186/2 "2022-08-29T02:15:40Z")

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You only need to call `System::playSound` if you want to play the sound back, and you do not need to play the `Sound` in order to modify its audio data. To get a pointer to the `Sound`’s audio data call [`Sound::lock`](https://fmod.com/docs/2.02/api/core-api-sound.html#sound_lock). With that you can manipulate the audio data as required, and when you are finished call [`Sound::unlock`](https://fmod.com/docs/2.02/api/core-api-sound.html#sound_unlock) to give control back to FMOD before playing it back with `System::playSound`.

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_[View the full topic](https://qa.fmod.com/t/adjust-the-sound-effect-without-playing-the-sound/19186)._