...more on the Language Engine for Pronunciation

The reason you need to know all the speech-sounds of your chosen language is so that you can not only read it, but also speak it, and understand it when you hear it.
The Language Engine uses the technical terms used by professional linguists because they are accurate, unambiguous and language-independent.
The everyday descriptions compare the sounds of the foreign language with those of Standard Southern British English, which most learners will have some familiarity with.
The description of the language normally includes consonants, vowels, stress, rhythm, mouth-position and sounds in connected speech.
Examples are given in phonetic symbols, using the International Phonetic Alphabet (IPA). Learning the IPA is an investment (if you don't know it already), because any further language study is likely to require it.
Virtually every example is supported by an audio recording.
Each vowel-sound is demonstrated in isolation, and each consonant is demonstrated between ah sounds.
A Glossary is included, explaining all technical terms.
Knowing sound-system of the language means that, when it comes to pronouncing the ordinary spelling, you have already done most of the work, because you know what the possible sounds are.