Pre-T means before taking testosterone. I suggest you watch videos by MeikoEliasXavier on youtube - he started testosterone, used it for a while, stopped for a while, then started again. I must say that his face looks more masculine now than it did when he was off T, but it didn't look completely feminine then either. He does talk about which changes are permanent and which aren't, so definitely see his take on it. In general, if your facial bone structure is changed on T, that wouldn't change back if you stop taking T, but the fat redistribution definitely goes back to a female-pattern (i.e. a softer/rounder face).
You would definitely keep the masculine voice, but many of the other things would go back to being more female-like. Not all things. But many.