A wibbly wobbly bass from the Roland System 100. There's some sort of complex LFO thing going on.
This is laid out for EXS24 only, but it should be easy to convert to other formats.
Courtesy of guest contributor Benji Merrison.
Slowish sub bass. Distortion adds extra pop.
Sub bass with FM'd tail. Distort for extra juice.
Velocity modulates fold depth.