Applications using Piper’s native C++ speech library avoid a pronunciation-map error that turned a tested Tagalog voice into noise. The library treated some two-part vowel sounds as their first character, attaching extra sound identifiers to ordinary vowels.
Ihor Shevchuk separates those combinations from single sounds. Verification produced recognizable Tagalog speech and preserved the expected English output. Eighteen of the 206 checked voice configurations contain the affected kind of entry; applications need to adopt the library correction.