I have been playing w/ 11 side by side. I'll tell you this much. No one has had any time to put into serious new patches. We have all been extremely busy. Things are calming down a bit now, at least for me. As far as the amps are concerned. How close was the Standard/Ultra sound to their respective amps. As far as accuracy, it can only come a maximum of that. There have been plenty of clips around here of the Axe-fx where people liked it better than the real deal compared side-by-side. That being said, you are correct A LOT of it comes from the feel department and how it reacts dynamically. Three things hit me about the II and amp modelling:
1. More powerful low end w/o the flubbiness. You can really get that in your chest thump with much less effort.
2. Dynamics - playing softly, volume rolled back, and playing with you fingers all react even better than before (subtlies in attack/bloom are easier to achieve)
3. Harmonic content - seems a bit less static/more complex. It is a subtle thing but you notice it when you compre the two side-by-side and let a chord just ring out.
Now none of these thing diminish how good the standard/ultra sounded before. They are not akin to changes going from a vAmp to a Axe-fx. It is much more subtle than that. It is very noticeable. And how it responds to your playing is readily apparent.
Add to this, it is much easier to dial in the amps. Less EQ (if needed there is one built right into the amp block), raw amps just sound better out of the gate (IMO). New features like input trim, geq, X/Y, etc. make dialing in a tone faster.
I hope that makes some sense. So the changes in tone are not earth shattering but the are noticeable. The changes in dynamics are very apparent when you play. Dialing is faster and simpler. These thing start adding up to a much improved (IMO) experience. Enough so that when I palyed the first chord on the thing, it just brought a huge smile to my face. That didn't happen on the Ultra (It took a 1/2 hour or so
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I will say this. You are NOT guaranteed to get the exact tone you had on the Ultra/Standard on the II. Many of the models are different. I decided after wasting a bunch on time trying to copy my presets exactly that is was not a very productive way of doing things. I used the old patches as visual templates and built things from the ground up. It is working a lot better that way. I only have a few of my presets ported over though. There has been much time for that until now.