This is just a quick video outlining a workflow i use to get better fine-grained control of my audio when recording game play and voice over using OBS Studio. There may be better ways of doing this and i'm open to learning if you have any suggestions. Its working for me right now and, it may work for you too.
NB. I noticed there is a channel mapping section in openshot after uploading this and so will look into that as that may be the key to separating the audio tracks correctly on the timeline.
Davinci Resolve under Linux requires some extra steps to be able to work with your source files. Resolve does now support native linux audio but, you have to convert your source video to a format Resolve supports otherwise you will see and hear nothing when importing your source material. Bit of a pain but, handbrake, ffmpeg are capable of converting your files to the required format(s) if you so wish.
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Blue Isle Studios (Valley): http://valleythegame.com/
OBS-Studio: https://obsproject.com/download
Openshot Video Editor: https://www.openshot.org/
Audacity Audio Editor: https://www.audacityteam.org/
Davinci Resolve: https://www.blackmagicdesign.com
On this page of the site you can watch the video online GNU/Linux Tech Tips - OBS - Control Your Audio with a duration of hours minute second in good quality, which was uploaded by the user Silent 24 August 2018, share the link with friends and acquaintances, this video has already been watched 178 times on youtube and it was liked by like viewers. Enjoy your viewing!