True but a recorded POD HD, Ampitube, Eleven, and many other modelers are indistinguishable from a real world amp recorded in a mix with drums and bass, even for most if not all guitar players and tone snobs. In a recording many modelers can sound better or equal to the real thing. Even POD 2.0 is on more records that anyone is aware of.
Actually that's only half right.
It depends on how deep you listen to the sounds in the recording.
I agree that in the frame work of a recording some modelled sounds are hard to pick out - most of the time it's the over the top distorted sounds that are already smashed down by compression.
Clean sounds are easier to tell the difference.
There's always a clue that gives it away.
Mostly dynamics when the player goes from a light picking to really digging in hard on the instrument - modelling doesn't deal with that style of playing as well as a real amp.
The analog front end on the HD 500 always gives it away because it clips out when you push it too hard and it's not the same kind of clipping that a tube amp does - it's more of a transistor over load sound which is added to the modelled sound.
It's the same way with sampled strings, horns and piano sounds.
It can fool a lot of listeners but I doubt you'll fool a top notch horn, string, or piano player.
I don't think Elton John will give up his baby grand for a digital piano.
It's all the little things that are left out of the model or sample.