the real answer to this question is you are building up, and breaking down the song via the EQ. If you haven't noticed listening to live sets, very rarely do dj's use effects besides on the ends of phrases, or throughout the build. Customairly one would add an Echo / Delay effect, coupled with bringing up or accenting the high's, mid's or bass parts essentially creating or simulating a greater rise or more pronounced lift to whatever the melody, riser, or noise, is doing. It also assists in creating more tension and exicting a key part of a song even more.
Also, when one is mixing, having two records playing simultaneously, and usually over and a top another track. EQing, or what your referring to as turning knobs, is blending the two tracks together to create a cohesive mix.
If your just starting out, begin with tbe bass. and start turning that "knob" to blend in with the bass of the track your bringing in or mixing out. Whichever you prefer.
Also, you'll notice when tracks are properly phrased, HiHats usually come in on the second phrase after the drop, so with that knowledge, you may want to EQ the highs so that you have only one percussion element sitting prominently within the mix.
Unless, the two rhythms have corresponding steps at which point you'll be able to play both. However, its still fun to stagger, or cut your highs, bass or mid's and introduce them at strategic parts throughout your mix.
Some do this quickly, while others tend to mix slowly. Its really a matter of taste and what genre you spin.
I'd also recommend that you look at the cutoff db's on your mixer. Some mixers like Rane have complete cutoff so that you don't hear the hi/mid/bass frequency at all. There are also mixers out there with cut buttons that simulate a greater reduction in volume of whatever frquency you're trying to reduce and opposingly enhance.
Also, and probably more professional (these days) is filter mixing which is integrated into the Pioneer DJM2000. This approach to mixing completley eliminates the frequency all together with absolutely no db being heard until swept it.
This emans that you can have the kick and the bass of one track playing perfectly with the mids and highs of another track with no audible sounds coming from the frquencies you've swept off.
Very cool and what a lot of the pro's are doing.
Anyways, this is just a mile high overview of what dj's are doing when they're turning knobs.
Last edited by DJRYAN™ on Apr-18-2012 at 02:59