@Matebu
You're not the only one who noticed; it's unnecessary for the audio engineer to manipulate his vocals like that! Granted Roga Roga is a limited singer, but he can deliever a good performance if coached.
He managed just fine with his previous songs like Polemique Generale and Love in Love, but I'm certain it required several days (if not months) of practice before he could convince his bandmates to give him space on albums to sing.
Being that he's the supreme leader of Extra Musica, he does so as he pleases...even if the results are subpar and even though Sonor Digital did great playing sebene, it's time to give a new guitarist some space to bring something new!