This is just my opinion, but if you are going to explore the very awesome sounds of Nebula and what it can do for your audio, upgrade to the Pro or even Server version. I know that it is more money, but well worth it. I found that I liked it so much I kept upgrading, where I could have just made one leap. But I also don't know the answer to your question regarding regular Nebula 3 and using compressors because I started using the Pro before Nebula compressors were that good. Good luck and I hope someone else who knows more chimes in soon. I just know that I don't have too much money, but upgrading my Nebula was the best investment in my audio life in a long time.