I'm talking about pinyin here. In Mandarin, there are to distinct sounds, one represented in pinyin by 'q', and one by 'ch'. It took me months to hear the difference, and months more to be able to pronounce them properly. I think there are other romanizations where the 'q' sound is represented "tch".
(In fact, I'm inclined to think that there are actually two different sounds in English as well; "witch" and "Charlie" don't feel the same in my mouth.)
> Technically the only voiced consonants in pinyin are m / n / ng / l / r.
I think we're using different definitions of "voiced". Other voiced / unvoiced pairs in English include g/k, b/p, v/f, z/s. See [1] for an "official" example of "voiced" being used the way I'm using it.
How else would you describe the difference between "qu" and "ju", or "chou" and "zhou"? The only difference I can feel is when your vocal cords turn on.