Reply to Tweaker Help

I'm extremely new to DJing. I was looking at buying the tweaker pretty soon, but I would just like to know if I can use it stand alone. Also, what sound card would be good to use as well? I have an apogee duet as my external sound card for producing, so I was believeing that I could just use that for output to monitors and everything would be alright. Any advice on this would be much appreciated!! Thanks!!!!