"For those having note detection troubles try to lower sound recording level on your line input (and use line input, not microphone). I put mine at 25%.
Also, cut the unused stereo channel (it must be channel 2). Also, check if exclusive mode is allowed on your soundcard (it should be).
You'll find all these settings in windows sound properties.
I've got no problem with this configuration with a realtek chip. I set rocksmith latency at 1 and let buffer size at its default value (216)."