Behold:
+ * ~ ,
Aside from the arsenal of characters --consisting solely of lowercase letters and numbers to be found on the English(US) keyboard layout-- (each representing a unique sound) per sé, we tap into the power of the four magnificent special-function characters above to convey the length and stress of each syllable.
- + means stressed & short
- * stressed & long
- ~ long
- , short
- ! the syllable{s} is/are being shouted; until !}
- _ whisper {}
- ^ capitalized, ^^ all-uppercase {}
- q and y as in awesome:*q,sym
- a as in Hahah! or Dr. Eleanor "Ellie"^,ha*ha! ,or ^{*dak,tr +e2,e,nr "^}+e2~i"
- w and e as in Arroway^+w,ryu,ei
- i as in /in!/!+in!
- u and 0 as in moodwar*mud~u0r
- 1 and o as in New York^,ni1u ^*iork
- x and z as in shenanigans,xn*w,ni~gnz
Spoiler: --the classy way would be to provide snapshots of a famous person depicting the facial gestures you associate with the tone you wish to imbue the text with and the style/enunciation/accent to be accommodated
Henceforth: your input's transcription