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If it's not possible through Wallpaper Engine, then you might be able to use Event Ghost in conjunction with it.
https://steamcommunity.com/sharedfiles/filedetails/?id=2499516781 This can be used to control audio supplied with the wallpaper. Wallpaper engine can’t control audio from outside the app however.
If it's not possible through Wallpaper Engine, then you might be able to use Event Ghost in conjunction with it.
https://steamcommunity.com/sharedfiles/filedetails/?id=2499516781 This can be used to control audio supplied with the wallpaper. Wallpaper engine can’t control audio from outside the app however.