so I picked up a Dean EAB fretless for a bluegrassy band I'm in. not gonna rave about it because it's a cheap bass and I'm sure others have probably pointed out some of it's flaws but I am happy with it until I can afford an actual double bass. it was a craigslist purchase and looked brand new when I got it, so I got a great deal on an already cheap bass. previous owner also graduated to a real upright bass so he barely played it. I'm currently playing it as if it was an upright by sitting it up vertically on a chair. I am playing it with some hearty slapping and the sound is picked up surprisingly well by the "dean passive pickup." unfortunately every so often a slap will be met by a loud buzz/distortion which doesn't go away until another good slap. until I slap it a second time to "fix" it the notes all sound like garbage. any clue what is going on here? as the PR stuff says, this is a passive pickup I guess.. could my problems be coming from the 9volt powered tuner that is wired into the pickup circuitry?? I don't need the tuner, each of my bandmates has a clip on tuner and I can certainly join the club if it will make it so I can return to my slap happy playing. I suppose I could also get another pickup besides the stock Dean one but I would like to keep from putting any money into this bass as that will cut into my upright funds.