Hello Friends, thank you all for your answers, but I am sorry to inform you that the degradation of the sound, occurs in both WAV, and Mp3. what happens is that sometimes they ask me certain songs in a relatively short time, and I can not create the MIDI, but the sequences are available on the internet and in Mp3 format, (of course in another Pitch). that's why I use the transposition resource of the Mp3, which premiered for the first time in the S950, and that came with these flaws, but that should have been corrected already in S775 / S975. the solution that DrakeM proposes to transpose the MIDI before passing it to WAV, is good as long as you have enough time to create the MIDI, otherwise the immediate option is to use the Mp3 available on the internet and solve it in the moment. Greetings. Hans