If I recall correctly, eSpeak on OS X is only available via command line (Terminal), which is why it cannot be selected as an .exe. I wonder if @taktik could help us here, figuring it out.
@Neuro_No_Neuro
I just upgraded to Catalina and tried change some patterns for selectable exe.
this pattern {"*.*"} forks for me. Nothing is greyed,
but i cant render sample because “espeak” dont work in my emulation / cpu not supported 
/
macOS version?
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hello,
I don’t have an original mac.
Just emulation via qemu and it’s not very nimble.
Unfortunately, it’s a low priority for me, maybe if someone with real hardware caught it and made a fork
I installed espeak with homebrew
it makes a symlink at /usr/local/bin/espeak to /usr/local/Cellar/espeak/1.48.04_1/bin/espeak
If i drag the symlink to ReSpeak it works
thanks for info.