Hello Rog
You are right, I'm comparing a semi hollow with a solid body (I built both guitars from the same plans).
What surprised me is the fact that a semi hollow body should sound fat and warm but in my case the sound is bright and I suppose this is due to the fact that the ash I used (european) is very very heavy and very very very very hard. This fact is driving me crazy because that sound is not what I expectes...
In relation to the approach you propose for the tests (2 identical bodies, same pieces,...) you are completely right: my test was not so scientific, I would only demonstrate to the friend who asked me that there is always a difference... The registration is the only element that is "scientific": I used the line 6 guitar port with a standard preset (like heaven is its name) that sets the amp type, the mids, the basses and all other settings...
I posted this message because I would have the feedbacks from other people on order to better understand.
Thank you all