I am not a pro player. My rig is a Line6 lowdown 400 amp, a GK4x10 cab paired with a Hartke 1x15 cab. I enjoy the options built in the amp, i.e deep switch, compressor, etc. However, I have noticed that many professional players combine other equipment with their rigs, i.e. equalizers, etc. I am not sure what other equipment are relevent. I want to achieve the beautiful, full, continuous bass sound of, for example, Lee Sklar. I have heard him a couple of times live with James Taylor and his sound is so full and encompassing regarding bass presence. What can I buy to shape a similar sound? Thanks in advance.