Whats tha best way to remix? do u use tha tempo tap? what do people do?

im not sure I understand the question.

If you're asking the best way to match an acapella to a beat, I would say start with the drums. Even it's something really simple with generic sounds and a simple pattern like Boom Bap Boom Boom Bap, just so it's on beat, from there you can add in more drum sounds and do your sample/synth/whatever work around that. I always get the tempo down first, and that's easiest to do with just drums.

Is that what you were asking?

i think wat theyre trying to do is find the tempo of an acapella or loop that theyve got from the song they wanna remix. . in which case id say just fiddle with the bpm till you get it right.. unfortunately the 404 only changes bpm in whole numbers so u cant get it perfect. . in which case chop up the original sample into multiple bits so u can retrigger the next bit before it goes out of time