why is does my L-2000 hiss very loudly whenever i put a 9V in it. It even hisses when in passive mode, if the battery is in it...but when i take the battery out...there is no more noise...but also no more active option . where is this loud hiss coming from???...i have not tested it outside of a BP-15 Squier bass amp. can someone help?...ahem...nino....ahem!