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It tends to be accurate to what it’s been given to profile having said that I found through practice that Profiling is itself not as simple as claimed, it is a bit of an art form. I personally haven’t encountered problems with the upper strings on the Kemper since the original fix for aliasing about 5 years ago, or at least no problems that don’t also show up on my real amps (bad pickup adjustment, old strings, fret issues), though someone on the Kemper forum recently did experience a problem that was down to poorly carved carbon saddle : In general for me the Kemper’s failings in terms of sounding accurately like a real amp tend to be nothing as easy to pin down. That’s why the world gave guitarists FX in the first place. It’s artists choice and albums and songs in the real world are about production and using the right sound for the part, it’s not about pursuit of pure amp tone.
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If you’re talking about albums, for example like the stuff Muse does well they were FX laiden when they were using real amps too. I’m not sure what you guys who say it sounds terrible or is fx laden have been listening to but most Kemper tracks I’ve heard tend to be dry as heck and sound the same as their real amp counterparts, honestly it sounds like you’re just trotting out the old arguments against sims from the distant past in general without having heard any actual Kemper tracks? (Or even any modern sim tracks come to that, they’ve all come a long way and chances are you’re not even aware of what is or is not a sim that you’ve heard if it’s on record). When it comes to deluxe verbs of course the spring verb is a must and it has a very nice model of one in there, I used it on a quick man of mystery cover when Kemper first added it (excuse the poor playing but you get an idea of the verb) : Without a real amp for you to profile yourself you will never know just how close it is, but trust me it is very close. Just be aware that the sound is the recorded/control room sound, not the sound of the amp in the room. Yeah, the Kemper is the way to go for your situation.