Voice matrix

[GlennGoddard]

Is there an easy way to determine what languages support Latin characters for speech conversion (other than testing each one)?
To elaborate, I speak English and I like different voices for different events. I like the accents given to certain voices when speaking English. The issue is that some of the voices for a given language translate to understandable English and some do not.
I like options, but I have noticed that since I removed --voice options from my config there is a significant load increase; I originally called out all 7 English languages but was reading around and found others using other languages for the accents...well I tried it and I like the effect.
So, to the point, in the future I will make the assumption that you will add more voices; it would be nice to maybe look at the chart in the readme that lists languages and see what language can play as another language. If there is a repository somewhere that references this, and you know about it that would potentially be nice to have.