DDJ400 with SAMPLER CONTROLLER

My Question??? is????? i have a DDJ 400 Controller and i want to do a lot more work within the sampler. I looked also at the ddj1000 but it has limited sampler controls. I'm looking to be able to controll the sampler volumes with EQ and pads.. Is there a controller that can be used to control the volume and EQ of the sampler with maybe the ability to use a filter knob.. I find i can only do it with the trackpad or mouse and it's very frustrating. I'd like to see an exclusive seperate conroller like the xp1 with volume controls, tempo slider and EQ .. Specific for the Rekordbox dj Sampler.....  Any help???