# Fmod lipsync question fmod volume affect spectrum extracting

**URL:** <https://qa.fmod.com/t/fmod-lipsync-question-fmod-volume-affect-spectrum-extracting/18274>\
**Category:** Unity\
**Created:** [January 26, 2022, 4:16am UTC](https://qa.fmod.com/t/fmod-lipsync-question-fmod-volume-affect-spectrum-extracting/18274 "2022-01-26T04:16:38Z")\
**Posts on this page:** 1\
**Page:** 2

<div class="post-metadata">

**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:** [February 25, 2022, 1:34am UTC](https://qa.fmod.com/t/fmod-lipsync-question-fmod-volume-affect-spectrum-extracting/18274/22 "2022-02-25T01:34:35Z")

</div>

> [@simingtu](#):
>
> can u tell me, why fader dsp’s value is at range -80 to 10 from your early response.

The perceived rolloff of sound is approximately logarithmic, -80 is a common minimum. The formula for converting from linear to dB is `20*log10(linear)`, to convert it back would therefore be `10^(dB/20-1)`

> [@simingtu](#):
>
> in the above code , i find three times. is there a easier way to get the root parent of tone group.

Unfortunately for your use case I think this is the best way I can think of

[Previous page](https://qa.fmod.com/t/fmod-lipsync-question-fmod-volume-affect-spectrum-extracting/18274.md?page=1)