Confusion about DSP Type

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?

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#/

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?

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