While I'm currently not a Fractal/any kind of modelling owner, I'm waiting to find the right company that can get my Blackstar Series One 1046L6 done or at least any of the other high gain Series One amps (the 200 with KT88 tubes or the 104EL34 with EL34s). I know I could probably just take a Kemper and profile the amp at my personal optimal settings, it wouldn't fully capture the flexibility that I love in my amp with 2 of Blackstar's unique features: Infinite Shape Feature (ISF) and Dynamic Power Reduction (DPR). ISF pretty much scoops things toward an American sound when turned counter clockwise and sounding like a Marshall. It's really interesting finding places in between rather than just a straight American or British 2 way switch like other companies have done. DPR is neat because it's sort of like compression/headroom on a knob and it feels really flexible to decide when you want the amp to break up.
Ideally I'd love to see Fractal model this amp so I finally have an excuse to make the jump. That's not to say Fractal clearly hasn't made other good amp models, but this one specific example is what would get me to make the jump. My ideal things to model from the Series One amps would mainly be it's OD 1 and 2 channels, though the super crunch channel is also pretty neat when you stick a boost in front of it. It would be neat to have a "Series One" model and have the power tubes as an option since all 3 amps I've listed share the same pre-amp tubes and only differ in their power sections. Having something similar to the ISF and DPR would be cool as well, but I'd mainly prioritize the ISF over the DPR.
For Fractal products, I've been told that I might be able to get in the ballpark range of the Series One using JVM or JCM 800 models, but that's a big maybe for me to take the plunge. So far my experience with modellers is renting an HX stomp this week and while I'm impressed with it, I'm still not able to nail my Blackstar's tones.
