5.1 & 7.1 mixdown and stereo monitoring

How does FMOD mixdown from any surround format (including 7.1.4) to stereo if the platform is not using a surround format? I read in the forums that you did away with SRS. What is the new method? And is there any officially sanctioned way to monitor how the mixdown will sound from within FMOD Studio? If I simply change the output bus back and forth from surround to stereo, my worry is losing surround panning and routing, or other potential unforeseen side effects. Would doing this be an accurate reflection of runtime mixdown? It would be great to have a simpler at-your-fingertips way of monitoring FMOD’s mixdown behavior on the fly.

The way that FMOD handles the downmix for any surround format to stereo is by using a mix matrix, although at this point we do not have this available in our docs, in the case of 7.1.4 the height speakers just get removed leaving 7.1.

In FMOD 2.00.00, the special case of 5.1 to stereo that used SRS downmix was removed, now FMOD makes use of mix matrices for all downmixes.

Currently there isn’t a way to monitor the mixdown visually from within Studio, the best way is to change your OS settings to different speaker configurations.

I have added a task to improve/add documentation around this subject as there is very little information on it in our docs currently.

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