maybe shotcut? that's what i use and i heard it has a better audio editor than many paid for programs, as well as lots of other features, no watermark, all kinds of rendering resolutions and formats. preview screen is laggy and unreliable, at least on my machine. not sure if it is considered a professional software, but it's often mentioned as one of the best free programs and i like it better than davinci resolve, which i kind of don't get how filters and stuff works in.