# FMOD\_Tremor cpu process **URL:** \ **Category:** FMOD Engine\ **Tags:** ue4\ **Created:** [September 24, 2020, 11:35am UTC](https://qa.fmod.com/t/fmod-tremor-cpu-process/16218 "2020-09-24T11:35:28Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![nmykhailov](https://avatars.discourse-cdn.com/v4/letter/n/bbe5ce/32.png) [@nmykhailov](https://qa.fmod.com/u/nmykhailov)\ **Post date:** [September 24, 2020, 11:35am UTC](https://qa.fmod.com/t/fmod-tremor-cpu-process/16218/1 "2020-09-24T11:35:28Z")
Hi! Could you please suggest what FMOD\_tremor\_mdct\_backward process is about? ---
**Author:** ![mathew](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/mathew/32/431_2.png) [@mathew](https://qa.fmod.com/u/mathew)\ **Post date:** [September 24, 2020, 10:23pm UTC](https://qa.fmod.com/t/fmod-tremor-cpu-process/16218/2 "2020-09-24T22:23:41Z")
That function is part of the decoding process for Vorbis encoded audio. ---
**Author:** ![cplab](https://avatars.discourse-cdn.com/v4/letter/c/8edcca/32.png) [@cplab](https://qa.fmod.com/u/cplab)\ **Post date:** [October 11, 2024, 11:29am UTC](https://qa.fmod.com/t/fmod-tremor-cpu-process/16218/3 "2024-10-11T11:29:12Z")
![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/a/af2d66df5da84dad35757e3582b1629d82b22d5a.png) Hi, what about fmod\_tremor\_book\_decodevv\_add? Cheers! ---
**Author:** ![mathew](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/mathew/32/431_2.png) [@mathew](https://qa.fmod.com/u/mathew)\ **Post date:** [October 13, 2024, 9:38pm UTC](https://qa.fmod.com/t/fmod-tremor-cpu-process/16218/4 "2024-10-13T21:38:48Z")
That is also part of the decoder for Vorbis encoded audio. All symbols with the `FMOD_Tremor_` prefix are part of that decoder, which is based on the source found [here](https://gitlab.xiph.org/xiph/tremor).