FWIW, and you may already have seen it, but here’s a thread where I had similar questions,
As I am in Europe I don’t have (affordable) access to the fancy CAT compressors, I got a local model that seemed equivalent but it was still way louder than I liked. After trying a few things I ended up settling for an airbrush compressor, and have been happy with it (it’s mentioned in the thread). For moderately aggressive metal cuts it works perfectly, and even though it’s not supposed to be operated for multiple hours on end, it has not died on me yet.
