Dear Pedrillo: I think that what you ask can/could happen to many of us under some special circumstances and depending on our each one experience/knowledge with live/real music evnets.
Our mind could be foolished with audio performances when we heard it off-axis, with some kind of recordings and as I say: de`pending on our each one experience/know-how on live music and musical instruments.
I never had that kind of experience where I " suffer " that " confusion ".
IMHO if you are and have deep experience in live music it is impossible to " suffer " a mix-up/confusion on-axis an almost impossible off-axis.
The sound of a live instrument performance is unique and with no single factor that could make we be confused about.
There are many characteristics in the sound of live music but at least these ones IMHO are unique and till today impossible to achieve in a home audio system ( I heard more than 100 different systems ranging from 10K-15K to 500K. ): the attack and transients, dynamic, full music " presence " , non-distortions/colorations/noise: REALITY!
How can we be " foolish " with those specific live music characteristics?
Some one posted that a recording is " different " from a live performance: well it is not only way different but a live performance IMHO is way better.
Regards and enjoy the music,
Raul.