Hi David,

You have Studio One Pro have you tried Ampire, the included amp sym?
You already have an audio interface. I have success recording my guitar directly into my Studio One Pro 7 via my audio interface. I have also used amp syms. In other words you may not need to purchase anything. I hope this helps.
YMMV


Life is short so make sure you spend as much time as possible on the Internet arguing with strangers.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware