Tape Saturation - Before & After Examples:
- Drum Bus - Notice the change specifically in the kick drum
- Bass Line - Notice the high-end rattle of harmonics that pop out
- Master Out - Listen for the warmth and "glue" that ties the whole track together

Some mix engineers have a hard time hearing tape saturation, so we've created this set of before & after examples so you can finally have an answer to the question "What is tape saturation?" We explore it the entire concept in more depth at the blog post below... In the video you will hear realistic amounts of tape saturation to help refine your ability to pick it out of the spectrum.

From: http://ledgernote.com/columns/mixing-mastering/what-is-tape-saturation-best-plugins/

"There's so much confusion around tape saturation, much of which arises from the huge leap from amateurs not knowing what it is to immediately wanting to use it in their recordings. Today we are going to answer the two critical questions: "What is Tape Saturation?" and "Which are the best (and free) saturation plugins available?" We're also going to destroy some myths surrounding this mystical phenomenon..."