I noticed an error about Scottish-English voice Fiona when i get it by shell.
Fiona is the only voice which use "-" as separator. All others use "_".
Best regardsDiego es_AR # Hola, me llamo Diego y soy una voz española.
Ellen nl_BE # Hallo, mijn naam is Ellen. Ik ben een Belgische stem.
Fiona en-scotland # Hello, my name is Fiona. I am a Scottish-English voice.
Fred en_US # I sure like being inside this fancy computer
Jean-Marc