Four-tracks have been getting smaller every decade. When I was a kid, in the 80s, I had one. A Tascam 244 (pictured 2nd in list) to be exact, that recorded four tracks of audio to a standard cassette tape. It was the size of a suitcase, and about as rugged as one, too. Remember those Tourister commercials with the gorilla? Exactly.
[caption id="attachment_28933" align="alignleft" width="490" caption="(from left: Teac reel-to-reel ca. '70s, Tascam cassette tape ca. '80s, Boss digital ca. 2000,... READ ON