My search turned up a thread or two, and from these I understand that since the controls are boost only tone should be pretty close to the natural bass's with both controls set flat. For example: http://www.talkbass.com/forum/showthread.php?t=184694&highlight=obp-1+flat My question relates to gain. I have an OBP-1 in a bass with passive pickups. Am I correct in assuming then, with the controls set flat, the it's the same as a passive bass? Or, is the output increased (gain) without any tone change or coloration?