Like a vocal amp that increases loudness, maybe turning your shouts into a 3 or 4 room radius.
Or a way to simultransmit too sic and voice for judges. For announcing sentencing and the like. Make judges more badass if sentencing echoes in your mind as they are doing it.
Or a lot of different things that you could toss into a cyber throat.
Some kinda rebreather.
Life alert style medical relay to sic. "CLIENT %NUM ALIAS %alias IS UNCONSCIOUS AND SUFFERING FROM MULTIPLE CONTUSIONS AT THE BLACK HOLE IN CUBBY HOLE ONE"
An artists speaker, for turning yourself into a human Theremin.
Lots of stuff you can do with the throat.
