No this is not some dodgy part, i cant seem to work out how to do buildups properly and i cant seem to finish them off right how do u do them from start to finish just so u know im using CDJ-800s mk2 and a numark dxm-09 mixer for the moment. musch appreciated

Exactly what do you mean?

Buildups and climaxes are typically part of the songs you're playing.

If you're thinking about it for your set, plan it out so that your lower energy tracks are near the beginning of the set, and you slowly build up to the highest energy tracks you have. You can do this numerous times in a set if it's long enough, but typically that's what DJ's do.

At least, that's what I do.

-r-