Yes it is true they don't bark. They are generally very quiet but when they are excited or happy they will yodel. If they are stressed or scared they make an awful scream
You can breed these colours. I am breeding this year from Pim Pim to my older girls and I should get tricolour and red and white puppies. If you breed tri to tri you only get tri. They also come in brindle which you shouldn't breed to tricolour as you get "trindle" which isn't good - it's where the brown bits on the tricolour have brindling.