Hi all.. I have a question that i couldn't solve. Today; after my excercises; i did my routine and shut down the amplifier than pulled the power supply off my efector. But i forgot to unplug the jack from the guitar. My bass has active pickups (Yamaha RBX375). I noticed; when i got home around 4 hours later that i forgot the guitar plugged. My question is; does an unpowered effector still use the batteries? I tried playing and it still gives sound; they are not completeley dead. Yet they may be used up for 4 hours without playing Can you clear this for me? Thanks..