As a beginning engineer, I just used Studio One 3 Artist, which came with my Audio Interface. I love Studio One Artist. Even after trying Pro-tools, I still want to stick with Studio One. I have bought some upgrades for it, including the pack that had the MP3 support, VST AU and ReWire support, the Remote Support, and the other things that came in that pack. I know you can get Melodyne (something I will probably eventually do), but is it possible to get all the other Studio One Pro features through the add-ons?