Mine are usually internal but some times go external.
Internal ones feel absolutely out of my control and say mean things usually, one of the prominent voices is very sinister and mocking, he says he has a silver tongue as well…which is pretty accurate. His location sounds like someone inputted the voice in the back of my head, and outside of my brain.
External ones usually are random whispering or very quick, the whispering had to be the most upsetting part for me…they were incoherent but very malicious in tone.
More often than not, I had internal ones, some times trying to convince me I’m fine and that everything is normal…even the fact they were also malicious and trying to do harm.