Hi Stefan, I facing a similar issue when I try to add SSML to my text from script. This is the code is I am writing in script: voiceOutput = "<s>I am now < prosody rate = \"x -slow\" > speaking at half speed.</ prosody >"+ "I am now<prosody rate= \"slow\" > speaking at 2 / 3 speed.</ prosody >"+ "I am now<prosody rate= \"medium\" > speaking at normal speed.</ prosody >"+ "I am now<prosody rate= \"fast\" > speaking 33 % faster.</ prosody ></s>"; Speaker.Speak(voiceOutput, null, Speaker.VoiceForName(Voice)); It works fine when I use it directly in the RTV text box. Also works fine for break strength property in SSML through script. But in other cases as the above example the sentences are read correctly but the SSML tags are ignored. How to solve it? Thanks in advance.