Glad the tutorials are helpful!
One thing we are always grateful for are specific feedback examples if something doesn't work well in your language. Audio files are the absolute best for this. So if that Th shape keeps showing up when speaking German, if you could share that audio for us and say what the issue(s) are, then that's something we can try to fix head on. If you post it here or DM me I can share it with the team.
I don't know all the details under the hood, but I do know each version adds more and more data (including languages), so hopefully with every release this will improve. Ideally, yes - we would love to have native support for more languages, and/or more customization options for the lip sync, and you list some great ideas there. I sincerely hope we get there sooner rather than later, and I think we will given how critical lip sync is to a great animated piece.
I gave German another shot using an audio book. Deep clear voice. Results seemed considerably better than with my own speech (deep mumbling through the thicket of my beard - a reason why I cannot really use the live tacking feature, but I'm fine with that). So, it could be me (too fast?) - or maybe it has to do with mic quality - a logitech mic used for skype and things. On the other hand Italian worked better... Anyhow, I will set up my condenser mic and try again. I'll let you know how I fare and provide samples if I cannot get rid of the Th mouth appearances.
Cool thanks. Yeah, the louder and clearer the better with lip sync. We do run a hard limiter behind the scenes to try to boost your signal and get the best results even in low conditions, but in general try to get that green audio bar as full as possible without clipping into the red.