# Confusion about DSP Type

**URL:** <https://qa.fmod.com/t/confusion-about-dsp-type/14016>\
**Category:** FMOD Engine\
**Created:** [July 25, 2018, 9:43am UTC](https://qa.fmod.com/t/confusion-about-dsp-type/14016 "2018-07-25T09:43:19Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![muyuenhao](https://avatars.discourse-cdn.com/v4/letter/m/ba9def/32.png) [@muyuenhao](https://qa.fmod.com/u/muyuenhao)\
**Post date:** [July 25, 2018, 9:43am UTC](https://qa.fmod.com/t/confusion-about-dsp-type/14016/1 "2018-07-25T09:43:19Z")

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Hi,everybody:  
I want to add some DSP types in my code,but I do not know how it plays.  
eg.When I add EQ and LOWPASS DSPtype,then how it plays? First Process EQ data, and base on EQ effect to process lowpass type ,or not?  
Anyone can help me?

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**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\
**Post date:** [July 27, 2018, 6:08am UTC](https://qa.fmod.com/t/confusion-about-dsp-type/14016/2 "2018-07-27T06:08:50Z")

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When you add a DSP to a channel, you also need to specify an index offset to add this DSP unit at in the DSP chain. This determines the order that the DSP’s are processed in.

[https://fmod.com/resources/documentation-api?page=content/generated/FMOD\_Channel\_AddDSP.html#/](https://fmod.com/resources/documentation-api?page=content/generated/FMOD_Channel_AddDSP.html#/)

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<div class="post-metadata">

**Author:** ![muyuenhao](https://avatars.discourse-cdn.com/v4/letter/m/ba9def/32.png) [@muyuenhao](https://qa.fmod.com/u/muyuenhao)\
**Post date:** [July 27, 2018, 6:47am UTC](https://qa.fmod.com/t/confusion-about-dsp-type/14016/3 "2018-07-27T06:47:37Z")

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> [@](#):
>
> When you add a DSP to a channel, you also need to specify an index offset to add this DSP unit at in the DSP chain. This determines the order that the DSP’s are processed in.
> 
> [https://fmod.com/resources/documentation-api?page=content/generated/FMOD\_Channel\_AddDSP.html#/](https://fmod.com/resources/documentation-api?page=content/generated/FMOD_Channel_AddDSP.html#/)

Thank you very much.I have another question,when I load DSP Plugin such as fmod\_noise.dll and fmod\_gain.dll to play a song,there is no voice at all.Anything wrong with thes dlls?

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**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\
**Post date:** [July 30, 2018, 12:08am UTC](https://qa.fmod.com/t/confusion-about-dsp-type/14016/4 "2018-07-30T00:08:17Z")

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Refer to [http://www.fmod.org/questions/question/add-dsp-plugin-well-but-failed-to-play/#sabai-entity-content-48100](http://www.fmod.org/questions/question/add-dsp-plugin-well-but-failed-to-play/#sabai-entity-content-48100)