> This is true, but you make it sound like this is a response to and even a solution for my comment I think it's a suitable response. There is enough allophoni

> This is true, but you make it sound like this is a response to and even a solution for my comment I think it's a suitable response. There is enough allophonic variation among speakers of a single language that undoubtedly someone perfectly reciting a narrow IPA transcription could be taken as a plausible native speaker. Even for your purposes (though I'm still not clear on what type of task your envisioning) the IPA could still be useful as an intermediary layer of abstraction, as in storing a mapping by language of IPA vowel symbols to the exact formants required.