i keep the curve sharp.
mix intros and breakdowns and cut on the drop.
make sure you know howlong the breakdown of song A is and the intro of song B is, thatway you can time the drops to happen at the same time (utilize both of their build ups) and then cut A out on the drop
you dont always need to cut, a fade before the drop works better sometimes too
I agree with all the comments about EQing here. Bass does tend to get muddy if you dont pretty much kill it outright. I tend to dampen the highs of the incoming track a bit too.
Also, use loops on those breakdowns. They can save your ass on a long blend or buildup to the next drop when your too busy eqing, etc. I tend to store it in a hotcue so i know exactly where it is.
The freeze delay effect can be used to fade out of a song pretty nicely too, especially if you catch it on some vocals.
I think the crossfader is a personal preference. With it you can have a high degree of control over abrupt things like beatcutting (see LTJ Bukem, Dara) Personally I have always used it and the eq to mix, but I’ve seen other people use the volume faders to mix drum and bass as well.