Certain sounds cause silent output

[Nicholas-Baron]

Tried to have it pronounce "wszystko"
https://en.wiktionary.org/wiki/wszystko

Input copied from website: /ˈfʂɨ.stkɔ/

It can say the first sound, but not any other.

[savetier]

Try ˈfʃɨstkɔ

[Nicholas-Baron]

It works, but from my hobbyist understanding of phonetics, /ʂ/ is not the same as /ʃ/. It may be close enough, but asking the user to change one sound into another feels "wrong".

[savetier]

You are right but the phoneme synthesis can't handle a lot of sounds, unfortunately.

[Nicholas-Baron]

Maybe detecting a sound that causes the output to be silent and suggesting "close enough" substitutions would alleviate the problem.