Well, using the USB makes your amp the interface and on Windows you have to monitor through the headphones jack of the Kat. I prefer the simplicity of my 8 inputs Behringer as the main interface and have a Katana always connected to one of the input. I can monitor through my studio monitors too. While enjoying the amp in the room sound. Except if you plan using two tracks L/R from the Katana USB, I record everything in mono from the line out and I have done lots of tests and it sounds as good as the USB, no difference as they share the same output settings. I even prefer the line out as the signal is stronger too. If you have a Gen3 you could use the headphones jack as it is now a true stereo ouput.
I could go "on and on" on those amps as I have been supporting a large community on FB, so I am limiting my reply but let me know if you have other questions.
Oh I see. I should clarify that it is my Focusrite Solo that is the 3rd gen model....my Katana is actually a first gen. I have it plugged in usb to the PC and playback on the PC speakers. I also have krk rokit 5's but I find that I don't need to use them since I am not tracking anything final yet. I'm still composing songs so I just record whatever using the katana.
My problem is I get excited for when the day comes when I'm finally ready to record some serious tracks and then I start to think about how I'm going to do that. There are soo many options. But what usually happens is I get option paralysis and end up not making a decision. I have a habit of talking myself out of things.
Here's an example of my thought process:
-My ego is telling me to mic up my amp and cabs so that i can say its MY gear being recorded. Ok I'd have to get a 50ft mic cable to run it to the other room. That's tedious especially since im not skilled in mic'ing, so I'll just capture it instead (which still requires skill) Many people said they've done the same thing and ended up going with a modeler or captured tone and got even better results for their mix and we're happier than micing their amp.
- Ok then I will go the modeler route. Do I want one that can record DI simultaneously? Capture too just incase? There's so many options. I have my Katana, isn't that essentially the same as a modeler using the Tone Studio? So what's the point of buying a modeler? Well because newer ones sound better....ok so do I want a newer Boss like a GX-10 or something else?
- But wait there are all these plugins I Can use, negating the need to buy a modeler. Super convenient. There are even free plugins that sound good, but I just don't want to go that route.
- Ok so get a modeler, but which one? I really want to try to AM4 but can't bring myself to schlep out $700 yet. (I know, Fractal are releasing plugins now). Should I get a Mooer ge250 or something like that? Well alot of people say they don't sound great while other people say you won't notice if it's real or not in a mix.
- But, but, but, my amps!! So then why do I have all these amps considering I never play out, if I am not going to use it to record?
-etc, etc, etc..
TL;DR - I have option paralysis while gassing for a modeler!