Multitrack is a term commonly used in the music industry to refer to a recording that has multiple channels of audio. Synonyms for the term could include multi-channel, multi-layered, or multi-source recording. Another synonym for multitrack is the term "stem" which refers to a group of tracks combined together to create a new mix. Other related terms include "separation tracks" or "isolated tracks" which are recordings that isolate specific instruments or vocals for remixing or editing purposes. Overall, the term multitrack represents a crucial aspect of modern music production, allowing for greater creative control and flexibility in mixing and mastering tracks.