I don't want to add more fuel, but I have a few questions and a few opinions

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4) It is not ignorance. I believe such an accusation is unfair. We have been reading all the comments in the forums and we have been compiling feedback so the audio. We know there are some issues with the audio but we are working to get these fixed to the best of our abilities.
The issue people are talking about is a lexico-grammatical one, not an audio or technical one. It seems like your hands are tied but you feel it would be more difficult to say so. Maybe it would be awkward to admit a mistake was made. I don't know. I don't have to worry about the feelings of a mass of people.
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5) All of us are native (or at the very least, speak at the level of a native). If we weren't/couldn't, we would not have been chosen for this project.
Do you mean native of any language or of Irish itself? Given the woman employed is not pronouncing things native or naturally, doesn't it mean ignorance, incompetence or negligence on the part of a few people. I'm not attacking your project and it's none of my business, but since it's on here, well one can comment (I haven't taken to Duolingo to say anything)
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One of the most important aspects of Irish phonology is that almost all consonants come in pairs, with one having a "broad" pronunciation and the other a "slender" one. Broad consonants are velarized, that is, the back of the tongue is pulled back and slightly up in the direction of the soft palate while the consonant is being articulated. Slender consonants are palatalized, which means the tongue is pushed up toward the hard palate during the articulation. The contrast between broad and slender consonants is crucial in Irish, because the meaning of a word can change if a broad consonant is substituted for a slender consonant or vice versa
-Wikipedia "Irish Phonology"
It's as obvious as the difference between a supermodel and a burns victim the difference, so neglecting to get the right person was an oversight. I can also imagine the voice artist -young, urban aand confident and believing herself a 'native' and no idea the difference existed either.
Below are an example of words. Not all are everyday words, but when Irish was in a healthy state, with 4 L sounds and 4 N sounds, masculine (red) and feminine (blue) and verb (orange) would be easily separated (by fortis and lenis as well). (It's true the vowels can be a bit different, but shorts vowels are not so important, it's the consonants that are key)
lann -blade.
lonn -fierceness.
lonn -anger, rage.
lon -ouzel family (lon dubh etc) [separate f you have a fourth n]
lionn -body humors (ancient medicine).
leann, lionn -ale.
lean -follow [separate f you have a fourth n].
leann -mantle/coat of mail
lainn -keen; severe. loinn -joy, gladness [only in phases, likely feminine)
linn -pool
Now I know, not a list of everyday words, nor would learners be expected to be that sensitive and native dialects show lengthening (Connemara) and diphthonization (Munster) before some of the consonants, but it is an example of purely dictionary seperation, never mind actual speech(vocatives, genitives and plurals)
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The most glaring mistake she makes is the inconsistent use of 'ch'. It is one of the most important sounds in Irish...
-Liamog on DuoLingo
Actually, it's not. There are ample records from Ulster of the wearing away of the broad fricative as well as the slender variety (Tyrone especially) and in Mayo, initial ch could be seen to be replaced by 'f'. For example, chuaigh Muiredeach go dtí an loch maith [xuaj mur'@d'@x g,d'iNLox max'] could be huaigh Muiredea' go dtí an la' with no great loss in meaning, while with 'don bhfear' and 'don bhfir', confusion would be a bigger problem. You could say there is a difference between
saliency and notice-ability . Broad and slender are not as obvious for everyone but are more salient as compared to the more noticeable broad ch and broad gh people sometimes worry about