As a kind of sidebar to this thread:
Many years ago I worked at a small station in the Green Mountain State. A gent walked in one day and asked if we used tape cartridges. I said we did and he handed me what I guess was a 4-track cart. He was the owner of a 'mom & pop' quick shop nearby that had an advertising device that, when a customer stepped on a mat, activated a tape player that play a sound effect of a cow going 'MOO' once. (Specifically, it was 'Elsie', the Borden cow.) The cartridge he handed me didn't work any more and he wondered if we could fix it. He had used the device for 'years' and told me it just stopped working. Since the gizmo at the store was plugged in, he thought it had something to do with the tape that was the problem. I opened the cart(ridge) and found that after a bazillion plays, the splice had come apart. I fixed the broken splice and handed the tape back to him. I believe there was a piece of foil for the cue purpose. There was only one 'MOO' on the short tape, so the tape had taken a beating but kept on playing. I never heard from the store owner again and I declined an offer of payment for services rendered. I may have suggested making a contribution to a local charity as an option.