On a Macintosh, SimpleText or Quicktime can open a CD Audio track. On a PC, Sound Recorder can record up to a minute of CD audio. Third party products include SoundEdit, Soundforge XP, RealJukebox, and Musicmatch Jukebox.
Most Macintoshes have microphone jacks, and some have analog audio inputs.
Most PCs have sound cards to connect microphones and analog audio sources. Be sure to enable input from these sources before recording. Under options, select properties, and then select recording. Then you can enable the audio inputs and adjust their volume. Audio from DV sources can be captured separately from the video.