Oh, shoot. I guess I just assumed it had sound support from the demo having it, sorry.
No worries at all! If you're interested, I'd encourage you to check out at how the sound was implemented for the demo here: https://github.com/okaybenji/text-engine/blob/itch/custom/audio.js
It's pretty straightforward, so definitely take a look if you're wanting to do something similar. I can help with this to some extent, so just let me know if you have any questions about it.