midi mapping question for a pioneer djm 800

[bentti2000]

hi folks quick question maybe some one can help me out with . im using my djm 800 as a midi controller fo a dj set, i want to be able to scroll between each clip so i can see the wave form of each song in each individual clip with one knob on the mixer, the knob i want to use is the time time control knob above the level/depth knob on the djm 800 mixer.i have alreday tried mapping this but when turning it it will not scroll accross all the clips can u tell me were im goin wrong thanks?