For those who don't know, the Pimsleur language tapes involved learning a bunch of phrases and repeating them back to the tape. This would build into full conversations using the phrases, along with dropping out particular words like changing "eat" into "drink". There was essentially no written component.
The lessons also had an element of spaced repetition: Phrases from lesson 1 would pop up again in lesson 3, and then again in lesson 7 just to check you hadn't forgotten them.
Paul Pimsleur marveled at the invention of the tape recorder, saying that now students would be able to record and practice samples of real language while on the go. Nowadays everyone has a 'tape recorder' and then some in their pocket, but most methods seem to ignore audio completely, or let it take second place to written language.