The gospeech repository is a port of gnuspeech from http://ftp.gnu.org/gnu/gnuspeech/ (C++) to Go
The V2 version is the one to use. The V1 version produces inferior sound and is in the respository for comparison only.
The port is complete and will properly produce speech from any word in the dictionary. Some of the functions in the C++ letter_to_sound directory have not been ported
12/20/2021 - Just tried the V2 version and though the waveform looks correct the file written is not readable as a wav file.