Re: Three vowel grades

> Dunno about Slovenian, but Serbo-Croatian(-Bosnian)'s tonal accents are
> *not* inherited from OCS. What happened was a retraction of the stress
> one step back, while the tone increase remained where the stress used to
> be. That's what the source is.
That's interesting, and another example of a non-tonal language becoming
tonal! I remember that SCB (I'll call Serbo-Croato-Bosnian that from now on)
does not allow accents on the final syllable.

I forgot to mention that Sanskrit had a tonal accent, which wasn't normally
marked in texts, which was lost in all (or almost all) modern Indic
languages. Did Avestan or Old Persian have a tonal accent?