Hey guys, i have a NOX krom seven 7.1 Headset, but sound doesnt work, and i dont know how to solve this problem. Any advice or something to help me.

Slackware 14.1 64bits multilib is on and i'm using KDE

Greetz
The first order of business is to discover if it is even being recognized. Run "lsusb" and see. It might even be worthwhile to try it, then unplug and plug back again and retry it. Once you know if the USB subsystem "sees" it or not (and possibly as what) then you can address sound. In KDE you can look in System Settings > Multimedia > Phonon to see if anything related is present or not.

1º problem solve
Another problem, teamspeak3 + chromium = sound don't work together. Or chromium + steam games = same problem.
i friend tell me i need to use a soundserver or something.

Hello again, I'm glad you've had some success.

Be careful of advice from someone running something other than Slackware. If you have any sound, you already have a sound server, likely ALSA which is very good. Most other distros use PulseAudio and while Slackware can as well, for various reasons many, including me, prefer ALSA. Many applications, including TeamSpeak and games, have configs a user must setup to inform it what server you prefer. TeamSpeak has an Options menuitem that looks very similar to KDE's System Settings > Multimedia. In there you will find such things as Playback and Capture. Games usually have Options > Sound menus for both server and sound quality. Most games will default to some simple setting that just works but a few require setup. Just check to see and you'll be fine. Steam works a charm.

In steam games ,like Counter-strike they not have options to choice my headset. What i tried to say was i can't hear for a multiple sources.

I have a microsoft LX3000 usb headset and one thing I've noticed is that neither chrome or chromium will play sound through my headset. Firefox works just fine, but the other two browsers won't even recognize it even though I have it set up in the .asoundrc to be the default sound output.