I bought one of these about nine months ago, and it has a really weird battery compartment. It looks as if a double AA should snap into it, but the pedal actually requires the regular 9 volt battery. The 9 volt does not snap into it, instead you just have to attach the battery to the connector and then just chuck it inside where it is more or less free to bang around inside the pedal. Am I missing somthing? What am I doing wrong? P.S.- Has anyone used this pedal while playing bass? What is your impression? Thanks!