Most cuneiform texts can be pronounced, which made it handy for adaptation for use with unrelated languages, even from different families. That’s how the Indo-European languages found recorded in cuneiform in the Hattusas site (non-IE were also found) were cracked by Emil Forrer.
http://www.ancientscripts.com/cuneiform.html
[snip] The term “cuneiform” is very deceptive, in that it tricks people into thinking that it’s some type of writing system. The truth is that cuneiform denotes not one but several kinds of writing systems, including logosyllabic, syllabic, and alphabetic scripts. [/snip]
http://www.ancientscripts.com/akkadian.html
“cuneiform texts can be pronounced”....... How is it possible to know how something is pronounced when no one has heard it spoken in thousands of years?