There's some non-freeware FOSS projects, especially in pursuit of some support. While the better ones either have an easy to use build system and/or just negwares if you download their "trial" version, projects like Ardour is a lot more involved. It has actual noise injected into the sound output, it has a convoluted build system (for which they don't provide build manuals - after forking, you'll find out it will also need a specific version of VS to build), and on top of that, an expensive subscription model.