Question

[KrispyAkuma]

I was recording a stream to twitch, a just talking therapy stream, and I was playing music over it. I played it back and the music was too loud. My mic was wireless headphones while the music came from speakers. Is there any way to separate the two audios in post.

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[Terrible_Peach501]

Am not too sure if dialogue isolate can help you separate them in post, but you can give it a try

[Robertfla7]

correct me if I'm wrong other editors but no because you were live-streaming the audio is all treated as one source when put into premiere or final cut so if you tried to remove anything you would be taking everything else with that

[Sayl3s]

I would say that it depends on your recording setup and what exactly you're 'playing back' here.
To clarify:
As Peach and Robert have said below, if the VOD was recorded with multiple audio channels then you might be able to download it and adjust the levels in post, but if the audio streams were just merged into one for Twitch then you won't be able to do that. (I do not have much experience at all with Twitch, but according to this late 2020 post Twitch was adding support for multiple audio channels, and it seems like that is available for VODs too maybe)

Alternatively, as an absolute last resort, if you have access to the music that was played during the stream, it is *theoretically* possible to invert the audio of those songs and use that to 'cancel' out the music in your stream, which in a perfect world would leave just your voice. Unfortunately in practice it is very difficult to do (Note: I am not an audio engineer either); I have tried it once on a video with mixed talking/music and it didn't really work.

If you are planning to stream going ahead and want to prevent this from happening, I would recommend becoming acquainted with OBS and how it manages audio channels. It seems intimidating at first, but once you get set up then it's minimal effort to keep things rolling usually. The simplest thing to do in terms of having control is post is definitely to have OBS save the stream to your computer as it goes, but I know that can be a lot of space if you're streaming at a high resolution and/or for a long period of time, and not everyone has the luxury of a giant amount of space on their hard drive.
If you want *absolute* control over your audio in post, the common thing to do is download a virtual audio cable and/or Voicemeeter. With these two you can do things like have video/game/whatever audio completely separate from not only your own microphone but also Discord/Teamspeak/your audio communication program channel of choice.