Vowel tones? What is that? I hear it for the first time.
Like soft and hard in russian? We don't have that.
I think not. Spanish I think still has "ch" (pronounced as in english). We don't. We use č (ч in Cyrillic). They also have stuff like ll in Castilla. For that we use љ in Cyrillic alphabet and because Latin alphabet sucks we need to use two symbols, lj (but this is still a single letter, like, it is in alphabet as "lj" and when you do crosswords you put "lj" in one field. One letter just 2 symbols for it. You never have j after l in Serbian anyway).