The record sides were sequenced for use with a record changer (1/6, 2/5, 3/4). By the 1980s, the use of a "record changer" was widely disparaged. The company also manufactured their own brand of player, the Monarch Automatic Record Changer. As V-M's record changer volumes declined, it became difficult for the company to remain profitable. V-M developed their first professional record changer in 1966. This professional record changer was only a two speed unit-it did not play 78rpm records. V-M Corporation, from the late 1950s through 1968, was the world's largest record changer manufacturer. The first 33rpm long-playing record changer was introduced to the public through this program.