I don't really understand what you mean by this. As far as voiced and unvoiced sounds in Japanese go, English speakers don't really need to pay much attention to them because English is basically the same. Just hearing "ba" or "ka" is enough for us; we don't need it explained because we understand it intuitively.
I don't think that it's entirely necessary to know that
kya is unvoiced, and
gya is voiced... This is how the syllabary is organized, and one thing I'm saying is that most books just skip over this aspect of organization.
I do agree that voiced/unvoiced sylables are more naturally understood than aspirated syllables.
What's the difference between "arigatou" and "aRIgatou," by the way?
The high tonality is on the
ri, it's more natural Japanese. I'm of the opinion that tonality is important to pronunciation, but that it's something you have to listen to, rather than memorize... I've always disregarded texts which point out where the rise and fall of tonality is, as it's only until you hear it pronounced by a native speaker that it makes much sense... At least to me...
Some Japanese learners I've spoken to disregard tonality altogether, and say that the way that they pronounce Japanese is natural, for them, much like the way that the way English might be pronounced by someone in ESL... I just prefer colloquial pronunciation.
Yes, I misspelled it in hiragana, but spelled it correctly in roumaji...
I don't know what you mean here either. As far as I'm aware ち is always pronounced [ʨ] (like English "ch" in "church" [both of them]). "Ta chi tsu te to" is a pretty good phonetic transcription of タ行, I think.
My own listening exercises seem to pick up a barely audible "t' at the beginning of where the chi syllable would start... The Kunrei-shiki & Nihon-shiki romanizations are both "ti" instead of "chi", so I think that this somewhat reinforces my theory.
The syllable ん was mentioned, which I find interesting when it ends a word... Listening to Japanese speech this syllable is nasal, so when we say X-chan... the n is not pronounced the way we would in English by ending the syllable by touching the roof of the mouth near the teeth... It's just something I've noticed that gets paid more attention to by native speakers...