..... I'm running a RealTech sound system. It don't get any better than that since they improved it. The RealTech is probably built into the MOBO. The computer isn't designed to take on an external board.
If your computer has a USB port open, you need to go to the music store and buy a decent external USB audio/midi interface.
Focusrite, Presonus, M-Audio...etc... they will all work better than the piece of junk RealTec built in sound card chip. While the RealTec card may work well for listening to mp3 files, you do not want to use it for full duplex recording and playback like we do. They might have improved it, but it still doesn't cut it for recording.
Pick up a nice external interface and install the drivers for it...ASIO.... and you will be amazed at the difference. All of the inputs and outputs on the interface will show up and synths will process properly and in sync without noticeable latency.
Things to look for in the interface you buy: USB connected, 2 channels minimum, audio pre-amps, hi & lo impedance inputs, a sufficient number of outputs as needed...some just supply a stereo (L/R) output, phantom power for condenser mics, uses NATIVE ASIO and not codecs or wrappers. With those specs, you should be good to go.
Since I started digital recording many years ago, I have been using an external Focusrite Saffire music interface. It has migrated from my laptop and now works flawlessly in my desktop DAW. I never use the built in chip for recording. Never.