# 5.1 & 7.1 mixdown and stereo monitoring

**URL:** https://qa.fmod.com/t/5-1-7-1-mixdown-and-stereo-monitoring/15458
**Category:** FMOD Studio
**Created:** [February 12, 2020, 4:29am UTC](https://qa.fmod.com/t/5-1-7-1-mixdown-and-stereo-monitoring/15458 "2020-02-12T04:29:33Z")
**Posts on this page:** 1
**Showing post:** 7

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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: [August 29, 2021, 11:13pm UTC](https://qa.fmod.com/t/5-1-7-1-mixdown-and-stereo-monitoring/15458/7 "2021-08-29T23:13:55Z")

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Here is some additional information on downmixing:

> [@Surround to Stereo Downmixing in v2.02: discrepancies between auditioning stereo in Studio vs in Engine](https://qa.fmod.com/t/surround-to-stereo-downmixing-in-v2-02-discrepancies-between-auditioning-stereo-in-studio-vs-in-engine/17594/2):
>
> SRS is no longer available in FMOD, we replaced it with a Dolby PL2 downmix, however that downmix is opt-in via FMOD\_INIT\_PREFER\_DOLBY\_DOWNMIX. The default downmix is a simple mix matrix performed by either the Core API or the Studio API. When the master bus is set to 5.1 and the output device is stereo, the Core API performs a downmix like this: { 1, 0, 0.707, 0, 0.707, 0 } { 0, 1, 0.707, 0, 0, 0.707 } When a Studio bus takes 5.1 input and is forced to stereo output the Studio API performs a…

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