[boomlinde]

Deciding on a product design that's easily marketable is also a marketing problem.

You suggest adding it as a "bonus", but for whom? Recording what on the walk? How would you advertise that along the main feature people actually buy the thing for? If not, what purpose does it serve? It's a few cents, but that's still a few cents too much if that's not what you're convincing people to buy.

Try to think of someone who didn't buy a walkman because it lacked a recording feature. What's their story? Can that easily be represented in the marketing material?