A w9 is a special tax form you send to the IRS every year (but as far as I know only if you make more than $600 per year in sales). Are you in the Composition discord server? Cuz literally 7 hours ago when you posted this someone asked this same exact question on there... LoL
Ah, I was just about to ask if those VST 3 are compatible with NP 4 play back engine. I do have Studio one, myself. But since, I have always been taught to read music, and it easier for me to write music using a notation program than DAW. However, I might use a DAW when I have actual studio...