I've recently launched a very poor attempt(it seems) to teach myself to play some slap. When I slap the strings I'm getting a very loud, ear piercing "pop" that sounds like I've taken the E string off the bass and whipped it against the pick-up. My drummer heard this and told me to stop before I damaged one of my horns. Can anyone tell me if this is a setting or a technique problem? I don't know any local slap players so I'm pretty much on my own with learning this. Just in case it helps, here's what I'm playing: Yamaha BB605 bass with a SWR Black Beauty combo/Goliath JR cab.