@Kenjiro Respectfully, this is incorrect. EDDI does support multiple voices, unless something about the recent Windows 11 update has affected it (I've heard reports that the latest Windows 11 update removes the
English UK
voice pack, at least for some people?).
I spent several hours with @etoree examining this issue. I never could convince him to test EDDI separately from the Sigma profile so that we could see what it was doing in isolation from VoiceAttack, but we did eventually find that the Sigma profile he was using as a base was referencing voices the with "Desktop" suffix when those suffixed names were not available in EDDI (the same names were available without the "Desktop" suffix but an exact match is needed for voice selection). Since the VoiceAttack profile was not matching an available voice, responses through the VoiceAttack Sigma profile utilizing those voices appears to have fallen back to system defaults.
If there were any underlying issues with EDDI proper then we were unable to view them clearly because EDDI was not tested in isolation and the issue described above was not addressed.