A plugin for OBS Studio that adds a filter which makes a source scale based on the audio levels of any audio source you choose

There are a few properties so you can fine tune how it behaves

OBS forums post
This plugin is not extensively tested, you may come across bugs

Get the archive/installer for your OS from the latest release.

Extract the archive in the OBS installation folder. Default is C:\Program Files\obs-studio.

The archive is for installing in the home directory
Extract it in ~/.config/obs-studio/plugins

Available in Flathub. You can find it on OBS Studio's page under Add-ons.

If you're on Arch Linux or an Arch-based distro, you can get the AUR package.
Use the AUR helper of your choice, or install it manually like this

# Pre-built binaries can be installed using the obs-scale-to-sound-bin package
git clone https://aur.archlinux.org/obs-scale-to-sound.git  
cd obs-scale-to-sound  
makepkg -i

brodi1 and tytan652 for the AUR Packages
Exeldro for the GitHub Actions workflow
OBS Studio team and contributors for making such a great tool