I was going to think about your ask properly after I got home, but then I completely forgot about it. I’m so sorry.

What will a mechanical race’s language sounds/looks like? I am not a linguist, so I can only guess. But Cybertronians most likely have a much wider vocal range, i would be interesting if their speaking language is tonal-based and their written language pictogram based on the word’s tonal identity.

It will make most organic species impossible to speak it, or be able to hear the whole range of their language, which serves (and/or fuels) Cybertronians’ xenophobia nature, it also make the written language very difficult for aliens to learn too.

It’s written in canon that Cybertronians can recognize people’s accent (Megatron being harassed by police for his Tarnian accent), so it’s natural to have different Cybertronian regions speaking different dialects, and I imagine they can range from mild tonal shift to basically a completely different language.  Also,
I imagine the pre-war senate would have had enforced some sort of
“standard Cybertronian”, probably the Iacon dialect, as their official language and
“proper” Cybertronian. Even though Cybertronians back then still largely spoke their home dialects outside of “official” occasions, after The Grate War, >90% of
the population was killed off, many dialects had probably died and forgotten long time
ago, the Official Cybertronian pretty much became the only language left.

Small head canon:

Cyclonus’ region was probably famous for it’s coarse and harsh sounding dialect (judging by his singling), but since no one speaks that dialect nor recognized his particular accent now, everyone made a huge fuss about Cyblonus’ singing and thought it’s a murder scene. If it’s the golden age, people would just be “Ohhh, the Upper Tetrahexian drinking song! A bar must be near by.”