Hi Shadi,
I'm using Mathematica 12 on linux (ubuntu).  Haven't tested the accessibility voice, but I see there is at least a menu for it.  
Is there anyway to load the missing voices?
I'm trying to build a simple cloud "spelling bee" program for a 2nd grader. Enter list of words, spell the entire word, spell the letters of each words. Trying to figure out what are the best options for (a) spelling out a word's letters, and (b) speaking out an entire word.  
SpeechSynthesize[] is more robust, but inherits the interface.  Speak[] is faster but lacks features and the voice sounds a bit too robotic.  
Is it possible to incorporate Speak[] or SpeechSynthesize[] in a clouddeploy form?   a local RPI3 is also an option but I'd prefer a cloud option.
Any suggestions/recommendations?
Thanks.
b