Text Speaker allows you to enter a customized pause length within your text. Put the cursor at the position where you want to add a pause, then click "Edit" menu >> Insert Pause.

Use one of the predefined pauses from .25 seconds to 5 seconds or click on user defined and enter the amount of time you would like.

Test your files by clicking on 'Speak' option on tool bar. If the pause is satisfactory then save your text and convert it to a mp3 file.

See the following example:
Turn text documents into MP3 audio or read them aloud on your PC.<silence msec="5000"/>

This advanced text-to-speech application turns words into audio with natural sounding voices.<silence msec="10000"/> Text Speaker can read aloud your documents, or you can convert them into MP3 files to listen to anywhere at anytime!