Hello: I thought of switching back to the previous version of eloquence , (Eloq ENU TTS - Nuance Version 6.01123) , and now the problem resolved. It seams , that's the hissing encounter is because of the Eloquence update of 125. Mostafa Al'mahdy. skype: mostafa-the-speaker Best Wishs. It's always hope that gives meaning to life. _______________