Word evolution game

[Rounin Ryuuji]

Wow this is very circular.

Dental stops to affricates.

[eːˈt̪͡s̪aːbo uˈniːbo d̪͡z̪e ˈmeːɟiko]

[Jonlang]

Loss of final vowels in words of over two syllables.

[eːˈt̪͡s̪aːb uˈniːb d̪͡z̪e ˈmeːɟik]

[Travis B.]

Lenition of final plosives to fricatives.

[eːˈt̪͡s̪aːβ uˈniːβ d̪͡z̪e ˈmeːɟix]

[Rounin Ryuuji]

Further lenition to semiconsonants:

[eːˈt̪͡s̪aːw uˈniːw d̪͡z̪e ˈmeːɟij]

[Jonlang]

Unstressed initial syllables disappear:

[ˈt̪͡s̪aːw ˈniːw d̪͡z̪e ˈmeːɟij]

[Rounin Ryuuji]

Long vowels take rising pitch before front vowels and palatals, and rising-falling pitch before back vowels and [w]; all other syllables take falling pitch

[ˈt̪͡s̪âːw ˈnîːw d̪͡z̪è ˈméːɟìj]

[Emily]

affricates to fricatives
[ˈs̪âːw ˈnîːw z̪è ˈméːɟìj]

[Jonlang]

Let's see what we can do to Quenya (the IPA is a guess, I'm not clued up on Quenya):

[man kenuva meːtim anduːne]

[Rounin Ryuuji]

I believe its /e eː o oː/ are generally thought to have been [ɛ ɛː ɔ ɔː], but that level of specificity wasn't really what Tolkien was aiming for.

In honour of this, however —

Mid vowel laxing:

[man kɛnuva mɛːtim anduːnɛ]

(Edit: It was apparently only the short vowels that were probably "laxer", but no take-backsies.)

[Travis B.]

Final vowel reduction and centralization.

[man kɛnuvɐ mɛːtim anduːnə]

[vegfarandi]

Stops preceding short vowels fricate

[man xɛnuvɐ mɛːθim anduːnə]

[Jonlang]

[nd] > [nn]

[man xɛnuvɐ mɛːθim annuːnə]

[Emily]

nasals palatalize when geminated, assimilate to adjacent consonant, and otherwise neutralize to /n/

[naŋ xɛnuvɐ nɛːθin aɲuːnə]

[Travis B.]

Nasals nasalize preceding short vowels.

[nãŋ xɛ̃nuvɐ nɛːθĩn ãɲuːnə]

[Jonlang]

Nasals deleted after a nasalised vowel

[nã xɛ̃uvɐ nɛːθĩ ãuːnə]

[vegfarandi]

Rhinoglottophila: nasalized vowels denasalize but pharyngealize preceding consonant.

[nˤa ħɛuvɐ nɛːθˤi ʕauːnə]

[Rounin Ryuuji]

Quantitative metathesis of [auː] > [aːu]

[nˤa ħɛuvɐ nɛːθˤi ʕaːunə]

[Jonlang]

[θ] > [s]

[nˤa ħɛuvɐ nɛːsˤi ʕaːunə]

[vegfarandi]

[ə] > [ɐ]

[nˤa ħɛuvɐ nɛːsˤi ʕaːunɐ]

[Jonlang]

Loss of final vowels in polysyllabic words, monosyllables have a centralised vowel.

[nˤɐ ħɛuv nɛːsˤ ʕaːun]