hello all. just curious as to what some of the other guys experience has been with how frequently you have to change the 9 volt with the buffer/pre amp and OBEL. I've changed mine twice in the past week and just was curious if this is common. I do play a lot, at least a couple hours a day and sometime as much as 5 or 6 hours a day on the weekend so its definitely been in use an awful lot. thanks for any input.