Terrible. On top of being capable of hearing other's thoughts and emotion, I could sense light, taste, smell. It's... fortunate that my friend taught me how to control my hearings. [He doesn't expect Penny able to imagine how that would truly feel, though, he could hardly blame her. It's a unique situation.

There's a definite pause after she asked him that question.]

... I can't remember anything prior to that.

[Essentially, he doesn't know how he came to be, where he originally came from, or his actual name-- if he even has one before 'Soundwave'. However, he doesn't seem to be bothered not knowing his own mysterious past.]