My current four are very distinct.

Mr Jones: wahhhhh. (when he wants some lovin')
wowwwwowwwoowwooww (when he wants his milk taste)

Cappy (foster) maaaahhhhh...

Snowy (meezer) MacGowwwwah.... (but with phlegm tone) when he wants on the patio.
Various long plantive crys when searching for his toy. (then muffled sounds, 'cuse he's got the toy in his mouth)

Bella (meezer) only has two settings: OFF and SHRIEK
(she sounds like a hawk attacking or a velociraptor)