You sound card should have a audio in port.
The best connection for your computer's audio to your stereo would be the line out connection on the computer to the auxilary input on the stereo amplifier.
That would be where you connect anything with a STEREO AUDIO OUTPUT.
Connect a audio cable from the Audio Out connectors on the cable box to the AUX In Audio connectors on the stereo receiver.
The audio outs should go to a AUDIO IN on your stereo system. You might need audio adapters to make the easy.
You can connect L7 nexis audio by first turning of your nexis audio set. Find a wire adapter or cable that is compatible with it and then hook it up to a stereo system.
Connect the av cable video plug to the composite video in (yellow). Connect the left and right audio to the stereo audio input, or connect these to your surround sound system.
You cannot connect a receiver to this TV. It has no audio outputs. You can connect your stereo to an external source, such as DVD or BluRay player, or a game console.
If the TV has an audio output, connect this to a stereo amplifier, and then connect speakers to this. Modern TV's don't have amplifiers for external speakers.
The purpose of an RCA cable or connector is to carry audio. It has a red connector for the right stereo channel and a white or black connector for the left stereo channel. One example of how an RCA audio cable could be used is to connect a CD player to other stereo equipment.
Computers normally have a 3.5mm jack socket as an audio output. Most stereo systems have phono (RCA) connectors for signal inputs. To connect a laptop to a stereo system you will need a 3.5mm jack to RCA lead. They can be purchased in most electronics stores or on line. Most audio systems have a selection of inputs. If there is a choice, you can use any input that is marked "aux", "line in", "CD", "DVD", "Tape". If there is an input marked as "phono" that will be the one input that you cannot use successfully.
Stereo VCRs have extra connections on the back to send the stereo to the TV or monitor. I don't believe you will find one with a stereo RF output. If you want to send a stereo audio signal to another room hook up a stereo modulator to the stereo RCA ouputs of the VCR and connect a MTS compatible TV to the coax at the other end and you will get the stereo audio.
Connect the Audio Out of the Sony set (Left + Right RCA) to the audio input of the X600 (1/8" stereo). You will need an adapter y-cable.
To record its sound, connect the left and right audio outputs to the line inputs on your M-Audio interface. Add a stereo audio track and then press record.