The guys over at swtorface.com created a short video showing all the voiced slash commands currently available on the public test server. This is slash commands like /apologize /cheer, /chuckle, etc etc etc. It’s apparently not complete yet, as it is possible to find more sound files when you data mine the client.
In this video you can listen to (and see the actions of) Smuggler, Jedi Knight, Trooper, Bounty Hunter and Imperial Agent
SwtorFace will be updating this as more commands become available. You can follow there progress here.