Not using developer mode.
The standard voice is annoying when saying tree instead of three.
I attempted to change the avatar, somewhere i read this is supposed to change the voice.
That did not happen. im using azure Text2Speech .
I have looked everywhere for a solution finally after 30 days decided to make a post.
Just some info for you, although you may already be aware but it is not mentioned. “Tree” is actually the correct “Pilot English” pronunciation of 3. (Also fife = 5 and niner = 9).
So if you are interested in realism, “tree” is correct.
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Thatch’s correct.
A little background: the reason for this is to minimize misunderstanding through radio communication. Actually the „th“ does not translate very well over radio.
In German for example we have zwei=2 and drei=3. Over radio 2 is often spoken as „zwo“ because „zwei“ and „drei“ sound very similar and can be easily misunderstood via radio.
And there is also the internationality of pilots which was taken into consideration bei the ICAO when defining the spelling of certain English words throughout aviation.
So „tree“ for 3 is absolutely correct 
It is not as pronounced with other pilot voices. I was attempting to change the pilot voice. is it possible to change it to a female pilot voice
All pilot voices say “tree” for 3. 
Select a female avatar for the pilot if you are doing the ATC responses. Or for the copilot if you are letting them handle the radios.