Text Speaker can export your audio in different quality levels of MP3 format. When you export to MP3 you are given a choice of settings. Try choosing the audio Setting "Very High Quality and Large Size". To avoid distortion, lower the volume level. Export again and you should have a clean MP3 file without any distortion. If you are an advanced user, you can also adjust the bitrate, frequency and number of channels to customize the exact output quality. See this page for more information: https://www.deskshare.com/help/ts/SpeakingTextToFile.aspx