quick question, so the valence runs about 4 hrs and then your lappy toggles to internals? at what point does that happen? is there any affect on the wav file being recorded when you switch from "AC" or valence to internal batts? so you are saying that you could get 4hrs from it and then another 2 from internals? so 6hrs total, that seems great. my new laptop came with 3 batteries but they only last about 2/5-3hrs with the lid open and i am a little concerned about booting up too early b4 a show and then being screwed. so far i have only run the laptop AC at shows. thanks.