I use "instrument cables" and ts cables interchangeably. The only difference i have found is that "instrument cables" seem to be more rugged and better build usually.
My friend was trying to get both of his channels on his pre to record into his stereo sound card. A normal guitar cable wouldn't work, I told him to get a one with 2 rings on the tip and then it worked. I don't know much about electronics/cables so I don't know...but the one with just one ring didn't work, everything recorded mono. He couldn't record 2 separate tracks until he used the one with 2 rings.