thank you for your advise, this video is only part of the test we did together with other musician friends, both in live and in studio we found minimal differences, I hope that the fact of not speaking well the English language did not create misunderstandings:
in various discussions on facebook and in other groups many said they felt a huge difference, so we decided to do this test (the video is my part of thetest) other users have done other experiments (Ebtech Hum eliminator, helix + mixer, helix + transistor power amp etc etc)