Now that text to speech voices have got so convincing, it is possible to get the computer to read the text in ReadLang - saving the hassle of synchronisation. On a chromebook, I use "Read Aloud" as a chrome extension (download from the webstore) and one of the excellent TTS Android voices from CereProc.

I wish they would do it.
For Now, i downloaded a video maker. I add the mp3 to a sky background and make a mp4 file.
With the mp4 file i upload it to youtube.
Then using the Readlang youtube feature i add that youtube videos weblink.

Once you learn it . It doesnt take that long.
hopefully they will give us an option to add audio files soon.

It