I noticed you have placed the narration in the sound (for instance:
play sound "1.mp3"). That works fine IF you are not using the built-in TTS utility. I am, and both your speech and the TTS are sounding off together. If you could, use voice instead (i.e.
play voice "1.mp3"). When you do, the TTS does not work, Ren'Py knows that there is a sound file displaying instead.
Thx.