Problem with PB PRO 912's dictionary

[crimeeee]

Hi people, ¿How can I listen to the words I look up in the dictionary?, because I have noticed that when reading a TXT or WORD file, I can´t listen to the words I wrote on the dictionary, but instead when I am reading some pdfs, even when they aren't in english, I can listen to the words by touching twice the word with the stylus. Hope you can understand my problem, and I apologize if this problem is already posted somewhere. Thanks.