# "Ratio" is not working when using side chain compression

**URL:** <https://qa.fmod.com/t/ratio-is-not-working-when-using-side-chain-compression/21642>\
**Category:** FMOD Studio\
**Created:** [May 21, 2024, 11:47am UTC](https://qa.fmod.com/t/ratio-is-not-working-when-using-side-chain-compression/21642 "2024-05-21T11:47:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![zsombor.bencsik](https://avatars.discourse-cdn.com/v4/letter/z/ee7513/32.png) [@zsombor.bencsik](https://qa.fmod.com/u/zsombor.bencsik)\
**Post date:** [May 21, 2024, 11:47am UTC](https://qa.fmod.com/t/ratio-is-not-working-when-using-side-chain-compression/21642/1 "2024-05-21T11:47:37Z")

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As the title suggests, ratio’s not doing anything when using the compressor effect in sidechain mode in FMOD Studio 2.02.14.

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<div class="post-metadata">

**Author:** ![li\_fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/li_fmod/32/6577_2.png) [@li\_fmod](https://qa.fmod.com/u/li_fmod)\
**Post date:** [May 22, 2024, 3:14am UTC](https://qa.fmod.com/t/ratio-is-not-working-when-using-side-chain-compression/21642/2 "2024-05-22T03:14:20Z")

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Hi,

I have tried with the version you provided and am unable to reproduce the issue as it seems to be working on my end.

Could you please share a screenshot of how you set the compressor effect side chain?

The `ratio` parameter only comes into effect when the input signal’s level exceeds the set `Threshold`. If the `Threshold` is set at 0 db, which is by default and is considered very high, the `ratio` will not have any noticeable effect unless the signal actually reaches or exceeds this level.

If that’s the case, you could try setting the `Threshold` below the peak levels(0 db) of your audio signals to see if the `ratio` and other compressor settings have any noticeable effect.

Let me know if it helps, please don’t hesitate to ask if you have more questions.