I think all kitties, like people, have different 'voices'. There are dogs that don't bark as well.
Come to think of it, I've never really heard my older cat meow either. She purrs and makes a little coo sound when she's really happy. And she yowled for a while at nights when our other cat got lost, but otherwise, she's almost a mute!
I used to have a cat, Midnight, (no longer here) who normally just made squeeking noises or silent meows. For some reason, she was able to meow under conditions that were probably stressful for her, for example, riding in a car or being at the veterinary clinic.
Mine's mostly a squeaker but will meow occasionally--It sounds a lot like whining--he'll also have conversations with me and makes "uh oh" noises when he about to get into trouble--it makes it hard to correct his behavior when he looks up at you with that cute face that's covered in flour and says "Uh Oh".
One of mine is a cooer, like a dove. Alot of the time, though, she just opens her mouth and nothing comes out. When she's really content, she just moves her lips! Coincidentally, I have never heard or felt her purr. Another one is a squeaker, and he can get really high pitched! I have never heard him make a normal meow. He's also 20 pounds. His girth and his squeak have combined to earn him the nickname "Mike Tyson"!
My goodness! I thought Romeo was big @ 15 pounds!!!
Romeo used to squeek too! He would also meow when he was going for a ride in the car, but I loved his squeeks! I miss his squeeks! There he was, a big fifteen pound black ball, and all that came out was "ee!" , although he would sometimes walk around and talk to himself....
Jake is a freaking opra singer. My new cat Jinx I think is part simiese (sp?) he talks so much - SUPER AT 3:00 AM! Oh Yea! Great!