Back to the original need, audio from YouTube videos can easily be extracted and converted, with no need to further degrade it by playing and re-recording through an audio channel.
In Firefox, install the “Download Helper” add-on. YouTube supports it. Download the needed video; then there are several ways to extract and convert the audio. The simplest, IMO, is to use AviDemux. Open the file in AviDemux, set the Audio dropdown box to PCM, then choose Audio > Save and name the file. AviDemux does not add any extension for you on demux conversions; you have to know and type in the correct one--“.wav” for a PCM file.
Uploads to YouTube are notoriously poor quality, however--regardless of the underlying codec. Older YouTube .flv files were a container which could handle a variety of audio formats, but the .mp4 standard--which is now the most common file on YouTube--uses AAC for audio almost exclusively. But the AAC bitrate is no indication of what quality the uploader actually had. Very, very few uploads have been done by professionals.
I am finding Linux to be a good alternative to Windows for audio work. It takes some effort to set up, but once accomplished, it is not going to put applications out to pasture like Win7 has.
JACK under Linux is an amazing program--an electronic patch bay for programs that support it. Cinelerra (video editor), Ardour (audio editor), and Rivendell (radio automation) all support JACK. And M-Audio and ASI soundcards have long supported Linux with drivers.