[Smiling Spectre]

Originally Posted by Japo

I don't mean writing alphabet, but sounds: how each is pronounced and how easy it is to distinguish between them or how hard it is to confuse two close ones :-)

http://en.wikipedia.org/wiki/Help:IPA_for_Spanish

Hmm... I believe, it's "easy" only for you, who knows the language beforehand. You know this sounds, you can distinct them. I don't know sounds, so just as I hardly can distinct vowels in "cat", "bet" and "dead" in English, I see not much sense in your β, ŋ and w by link above. (I suppose, I would have the hard time, distincting β, v and w in Spanish. Other letters seems have direct analogues either in English, or Russian, so I would have no problems with them, possibly.