[Harp-L] Questions re: blue notes and micro-tonality



I am trying to learn more about the correct pitch of the "blue notes" in traditional blues tonality. I have not been able to find much reference material on this subject. The blue notes in the blues scale are the flat 3d, flat 5th, and flat 7th.
As i understand it, in traditional blues tonality the flat 3d is supposed to be played a quarter tone flat, and is called a "blue third." BUT, that same note is also the flat 7th of the IV chord and, as I understand it, when played as a flat 7th that note should be played a half step flat in traditional blues tonality, NOT a quarter tone flat.
Okay, a "blue third" is a quarter tone flat. QUESTION: What is the correct traditional blues tonality for a "blue seventh"? Is it a true minor 7th (half step flat) or is it played 3/4 step flat, like Little Walter did by bending draw 5 down a quarter tone on some of his better known tunes?
ANOTHER QUESTION: What is the correct traditional blues tonality for the "blue fifth"? I have seen one reference that suggests the "blue fifth" (flat 5th) is played a quarter tone flat in traditional blues tonality, like the "blue third." Is this correct?
The micro-tonality of the blues constitutes such a fundamental expression of emotion in the blues idiom and is readily played on a diatonic harmonica. How far flat a blue note is bent, and whether or when the flatted blue note is released to resolve into the major chord is an important (and very cool) aspect of playing blues on the diatonic harmonica. But although i think i understand the nature of the "blue third" I am interested in whatever any of you can tell me about the proper traditional blues tonality for the "blue seventh" and "blue fifth." Please enlighten me with more detailed information on this topic . Thanks.
JP




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