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TV audio can be routed to a soundcard either via analog RCA, digital COAX, or SPDIF, depending on what is available on your specific TV and soundcard models.
you don't
My PC's soundcard is connected to an auxiliary jack on my stereo, rather than the PC speakers. Ask at a computer store; they can help you out with cables/wiring, etc.
You should look for a good Form Factor, Chipset, Memory type, Max CPU and a desired Max Memory and Memory slots. It also depends on what you're looking for in a soundcard.
Yes and with the extra features it comes with, you might say that is is better.
You need either a motherboard that has built-in 5.1 or better capability; if you don't have that, the only alternative is to add a soundcard that has the capability. If you're currently using the onboard sound, you'll have to disable the onboard sound in the BIOS before using the new soundcard.
The best soundcard for recording guitar is the Focusrite Scarlett 2i2.
A USB soundcard may tax your processor and can introduce some latency.
If you have an audio interface, you may not need a separate soundcard as the audio interface can handle the functions of a soundcard and provide better audio quality and connectivity for your setup.
Yes -- your soundcard can be used to record from virtually any source.
A reasonably fast PC/Mac External Soundcard with low latency (onboard sound not good enough) Monitors and/or speakers Mixer (optional)
Go to the soundcard manufacturers web site to download a copy of the drivers. Alternatively, if the soundcard is integral to the motherboard, use the motherboard installation disk to find the soundcard drivers.