I’ll try and respond more this later...at work now and not much time.
but first off (and this is pure preference from experience), I would ditch studio one and use something else. Even garage band! I’ve had nothing but problems with presonus software crashing my systems. Anyway...
Not sure what you are using for your AI, but if it is a mixer or anything else with a built in preamp, you’re going to have to do a lot of tweaking to get a good direct sound. The pro x has an amazing cabinet emulator and direct recording is incredibly easy.
i use a presonus usb audio interface straight to my MacBook that works great and has very little latency (just don’t use the software! lol). From there, you should be getting whatever tone you are dialing in on your pro x. Monitor from the MacBook outs for best overall tone and mix.
A lot of the patches on the pro x can be very bassy, so you might want to run a high pass on it to compensate (There’s a good little ‘quick’ article on low/high pass filtering here: https://theproaudiofiles.com/audio-pass-filters/ ). Try and not rely on headphones too much when mixing as it is not going to be a true mix and you can hear a LOT more in the headphones. Use your monitors and watch your peaks. I like to normalize to about 85%, but a lot of people frown on normalizing.
Trust your ear! If it sounds good to you and you can hear everything...you’re probably pretty close or even right on!
Keep an eye on frequencies as well. A bass drum and a bass guitar share similar frequencies, so you’ll want to keep them away from each other by panning. Vocals and keys are similar, guitar and everything else shares similar frequencies! Lol
I’m no master recording engineer, but I’ve been doing it for 30+ years and have a pretty good idea on what works and what doesn’t. Trial and error is the best tool for figuring out how this stuff works. When I was learning, I didn’t have the internet to rely on for resources, so figuring out what works by my mistakes was huge.
Again, I’ll try and post more later. I don’t have a LOT to share, but hopefully enough to get you started.