It's a feature we will not do directly on the client. It's something reaaaally specific and not related to the project. But I think it's possible to do some hacky things.
@pgorley: Do you have any thoughts on this? Maybe a magic filter?
I know @atraczyk played a bit with robotic voices too.
@sblin FFmpeg doesn't provide an out of the box pitch shifting filter. I'm not sure it would be worth the effort for something so specific. It would also introduce some lag in the audio (need to accumulate samples and modify them before sending them).
or connecting a lv2 plugin into it but I don't know if jami supports
Jack audio server now since I opened this issue when I was testing it
long time ago