I'm an ad man and marketing guy so I am ALWAYS contemplating appeals. Back many, many years ago I came across a story about Pillsbury's launch of a biscuit mix which only required user to add water and bake for wonderful tasting biscuits. The market rejected this mix because there was too little for the user to do to claim biscuit success for her own doing. Pillsbury changed the campaign to "just add milk" which was enough to get the product off the ground. This story is the equivalent to the use of a CD Player or a Turntable. The Turntable requires user input for the best result, while the CD Player requires no interaction at all. In other words satisfaction with a TT is somewhat about what the user puts into it.