# Need some clarification on Sync Points

**URL:** <https://qa.fmod.com/t/need-some-clarification-on-sync-points/20041>\
**Category:** FMOD Engine\
**Created:** [March 30, 2023, 1:31pm UTC](https://qa.fmod.com/t/need-some-clarification-on-sync-points/20041 "2023-03-30T13:31:51Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![orangetek](https://avatars.discourse-cdn.com/v4/letter/o/97f17d/32.png) [@orangetek](https://qa.fmod.com/u/orangetek)\
**Post date:** [March 30, 2023, 1:31pm UTC](https://qa.fmod.com/t/need-some-clarification-on-sync-points/20041/1 "2023-03-30T13:31:51Z")

</div>

Hi, when a callback is fired from a sync point event, is it instant? or is it based on when system::update is called?

Regards

---

<div class="post-metadata">

**Author:** ![Connor\_FMOD](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/connor_fmod/32/3685_2.png) [@Connor\_FMOD](https://qa.fmod.com/u/Connor_FMOD)\
**Post date:** [March 31, 2023, 6:04am UTC](https://qa.fmod.com/t/need-some-clarification-on-sync-points/20041/2 "2023-03-31T06:04:59Z")

</div>

Hi,

Are these sync points that are added to the audio file or in FMOD Studio?

---

<div class="post-metadata">

**Author:** ![orangetek](https://avatars.discourse-cdn.com/v4/letter/o/97f17d/32.png) [@orangetek](https://qa.fmod.com/u/orangetek)\
**Post date:** [March 31, 2023, 7:01am UTC](https://qa.fmod.com/t/need-some-clarification-on-sync-points/20041/3 "2023-03-31T07:01:34Z")

</div>

FMOD Core Sound::addSyncPoint. I basically want to know if I can change FX and custom DSP parameters with sample accuracy.

---

<div class="post-metadata">

**Author:** ![orangetek](https://avatars.discourse-cdn.com/v4/letter/o/97f17d/32.png) [@orangetek](https://qa.fmod.com/u/orangetek)\
**Post date:** [April 1, 2023, 8:59am UTC](https://qa.fmod.com/t/need-some-clarification-on-sync-points/20041/4 "2023-04-01T08:59:36Z")

</div>

bump

---

<div class="post-metadata">

**Author:** ![Connor\_FMOD](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/connor_fmod/32/3685_2.png) [@Connor\_FMOD](https://qa.fmod.com/u/Connor_FMOD)\
**Post date:** [April 2, 2023, 10:22pm UTC](https://qa.fmod.com/t/need-some-clarification-on-sync-points/20041/5 "2023-04-02T22:22:59Z")

</div>

Hi,

Thanks for the extra info. Since you are using the `Core System` then they will fire from `system::update`.