 The 2340 ran at either 3¾ or 7½ inches per second and used 7-inch reels while the 3340 ran at 7½ or 15 inches per second and used 10½ inch reels.The 2340 was priced at under U.S. $1,000 making it very popular for home use.The advent of the compact audio cassette (developed in 1963) ultimately led to affordable, portable four-track machines such as the Tascam Portastudio which debuted in 1979.