Upgrade, (Also known as Erin Burke) was a former member of the group in the early days. However she was kicked out due to leaving practice early, and not showing up to the shows they did at the time. This was mainly due to her other commitments as an actress. This is also much more obvious when in all videos from when she is in a song, she rarely sings, or plays an instrument. Many times she does what Rabbit does, which is be the clown to some degree. During rehearsals she struggled (according to Rabbit who honestly is super nice about it.) and refused to learn her parts. It was a mutual agreement at the time, any resentment doesn't seem to show. (But for the record find stuff on this subject is a pain in the butt.)