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Multitrack recording (MTR, also known as multitracking,"double tracking" or just tracking for short) is a method of sound recording that allows for the separate recording of multiple sound sources to create a cohesive whole. Multitracking became possible with the idea of simultaneously recording different audio channels to separate discrete "tracks" on the same tape—a "track" was simply a different channel recorded to its own discrete area on tape whereby their relative sequence of recorded events would be preserved, and playback would be simultaneous or synchronized.
In the 1980s and 1990s, computers provided means by which both sound recording and reproduction could be digitized, revolutionizing audio distribution. In the 2000s (decade), multitracking hardware and software for computers was of sufficient quality to be widely used for high-end audio recording. Though magnetic tape has not been universally replaced as a recording medium, the advantages of non-linear editing (NLE) and recording have resulted in digital systems largely superseding tape.
Multitracking can be achieved with analog recording, tape-based equipment (from simple, cassette-based four or eight trackers to 2" reel-to-reel 24-track machines), digital equipment that relies on tape storage of recorded digital data (such as ADAT eight-track machines) and hard disk-based systems often employing a computer and audio recording software. Multitrack recording devices vary in their specifications, such as the number of simultaneous tracks available for recording at any one time; in the case of tape-based systems this is limited by, among other factors, the physical size of the tape employed. Some of the biggest professional analog recording studios used a computer to synchronize multiple 24-track machines, effectively multiplying the number of available tracks into the hundreds. The rock group Toto recorded their fourth album on four computer-synced 24-track machines, for example.
For computer-based systems, the trend is towards unlimited numbers of record/playback tracks, although issues such as memory and CPU available will in fact limit this from machine to machine. Moreover, on computer-based systems, the number of simultaneously available recording tracks is limited by the sound card discrete analog or digital inputs.
When recording, audio engineers can select which track (or tracks) on the device will be used for each instrument, voice, or other input.
At any given point on the tape, any of the tracks on the recording device can be recording or playing back using sel-sync or Selective Synchronous recording. This allows an artist to be able to record onto track 2 and, simultaneously, listen to track 1, 3 and 7, allowing them to sing or to play an accompaniment to the performance already recorded on these tracks. They might then record an alternate version on track 4 while listening to the other tracks. All the tracks can then be played back in perfect synchrony, as if they had originally been played and recorded together. This can be repeated until all of the available tracks have been used, or in some cases, reused. During mix down a separate set of playback heads with higher fidelity are used.
Before all tracks are filled, any number of existing tracks can be "bounced" into one or two tracks, and the original tracks erased, making more room for more tracks to be reused for fresh recording. Beatles producer George Martin used this technique extensively to achieve multiple track results, while still being limited to using only multiple four-track machines, until an eight-track machine became available during the recording of the Beatles' White Album. The Beach Boys' Pet Sounds also made innovative use of multitracking with 8-track machines of the day (1965–66).
Multitrack recording also allows any recording artist to record multiple "takes" of any given section of their performance, allowing them to refine their performance to virtual perfection. A recording engineer can record only the section being worked on, without erasing any other section of that track. This process of turning the recording mechanism on and off is called "punching in" and "punching out". (See "Punch in / out".)
When recording is completed, the many tracks are "mixed down" through a mixing console to a two-track stereo recorder in a format which can then be duplicated and distributed. (Movie and DVD soundtracks can be mixed down to four or more tracks, as needed, the most common being five tracks, with an additional Low Frequency Effects track, hence the "5.1" surround sound most commonly available on DVDs.)
Most of the records, CDs and cassettes commercially available in a music store are recordings that were originally recorded on multiple tracks, and then mixed down to stereo.
In some rare cases, as when an older song is technically "updated", these stereo (or mono) mixes can in turn be recorded (as if it were a "submix") onto two (or one) tracks of a multitrack recorder, allowing additional sound (tracks) to be layered on the remaining tracks.
During multitracking, multiple musical instruments (and vocals) can be recorded, either one at a time or simultaneously, onto individual tracks, so that the sounds thus recorded can be accessed, processed and manipulated individually to produce the desired results. For example, after recording some parts of a song, an artist might listen to only the guitar part, by 'muting' all the tracks except the one on which the guitar was recorded. If one then wanted to listen to the vocals in isolation, one would do so by muting all the tracks apart from the vocals track. If one wanted to listen to the entire song, one could do so by un-muting all the tracks. If one did not like the guitar part, or found a mistake in it, and wanted to replace it, one could do so by re-recording only the guitar part (i.e., re-recording only the track on which the guitar was recorded), rather than re-recording the entire song.
If all the voices and instruments in a recording are individually recorded on distinct tracks, then the artist is able to retain complete control over the final sculpting of the song, during the mix-down (re-recording to two stereo tracks for mass distribution) phase.
For example, if an artist wanted to apply one effect to a synthesizer part, a different effect to a guitar part, a 'chorused reverb' effect to the lead vocals, and different effects to all the drums and percussion instruments, they could not do so if they had all been originally recorded together onto the same track. However, if they had been recorded onto separate tracks, then the artist could blend and alter all of the instrument's sounds with complete freedom.
Multitracking a song also leaves open the possibilities of remixes by the same or future artists, such as DJs. If the song was not available in a multitrack format recording, the job of the remixing artist could be very difficult, or impossible, because once the tracks have been re-recorded together during the mixdown phase, they are inseparable. Theoretically, one could use frequency selective filters for this, but in reality this has not been done with any great degree of success because of the multi-harmonic (having many frequencies) nature of many musical instruments and voices.
The process was conceived and developed by Ross Snyder at Ampex in 1955 resulting in the first 8-track machine which used 1-inch tape. This 8-track recorder was sold to Les Paul for $10,000. It became known as the "Octopus". Les Paul, Mary Ford and Patti Page used the technology in the late 1950s to enhance vocals and instruments. From these beginnings, it evolved in subsequent decades into a mainstream recording technique.
Since the early 2000s, many performers have recorded music using only a Macintosh computer or PC as a tracking machine. The computer must have a sound card or other type of digital audio interface with one or more Analog-to-digital converters. Multitrack recording software must be installed on the computer. Microphones are needed to record the sounds of vocalists or acoustic instruments. Depending on the capabilities of the system, some instruments, such as a synthesizer or electric guitar, can also be sent to an interface directly using Line level or other inputs. Direct inputs eliminate the need for microphones and provide another range of sound control options.
There are tremendous differences in computer audio interfaces. Such units vary widely in price, sound quality, and flexibility. The most basic interfaces use audio circuitry that is built into the computer motherboard. The most sophisticated audio interfaces are external units of professional studio quality which can cost thousands of dollars. Professional interfaces usually use one or more IEEE 1394 (commonly known as FireWire) connections. Other types of interfaces may use internal PCI cards, or external USB connections. Popular manufacturers of high quality interfaces include Apogee Electronics, Avid Audio (formerly Digidesign), Echo Digital Audio, Focusrite, MOTU, RME Audio, M-Audio and PreSonus.
Microphones affect recording quality. A single studio quality microphone can cost $5,000 or more, while consumer quality recording microphones can be bought for less than $50 each. Microphones also need some type of microphone preamplifier to prepare the signal for use by other equipment. These preamplifiers can also have a major effect on the sound and come in different price ranges, physical configurations, and capability levels. Microphone preamplifiers may be external units or a built in feature of other audio equipment.
Multitrack recording software can record multiple tracks at once. It generally uses graphic notation for an interface and offers a number of views of the music. Most multitrackers also provide audio playback capability. Some multitrack software also provides MIDI playback functions not just for audio; during playback the MIDI data is sent to a softsynth or virtual instrument (e.g., VSTi) which converts the data to audio sound. Multitrack software may also provide other features that qualify it being called a digital audio workstation (DAW). These features may include various displays including showing the score of the music, as well as editing capability. There is often overlap between many of the categories of musical software. In this case scorewriters and full featured multitrackers such as DAWs have similar features for playback, but may have less similarity for editing and recording.
Multitrack recording software varies widely in price and capability. Popular multitrack recording software programs include: FL Studio, Adobe Audition, Pro Tools, Digital Performer, Cakewalk Sonar, Samplitude, Nuendo, Cubase and Logic. Mixcraft, REAPER and n-Track Studio are popular low cost alternatives to more expensive and more versatile software options. Open-source and Free software programs are also available for multitrack recording. These range from very basic programs such as Audacity and Jokosher to Ardour, which is capable of performing many functions of the most sophisticated programs.
Instruments and voices are usually recorded as individual files on a computer hard drive. These function as tracks which can be added, removed or processed in many ways. Effects such as reverb, chorus, and delays can be applied by electronic devices or by computer software. Such effects are used to shape the sound as desired by the producer. When the producer is happy with the recorded sound finished tracks can mixed into a new stereo pair of tracks within the multitrack recording software. Finally, the final stereo recording can be written to a CD, which can be copied and distributed.
Order of recording
In modern popular songs, drums and percussion instruments are often among the first elements to be recorded. These are usually the rhythm leaders, musicians recording later tracks keep to the precise attack of the drum sounds. The drums may be recorded for a few seconds then looped. Click (metronome) tracks are also often used as the first sound to be recorded, especially when the drummer isn't available for the initial recording, and/or the final mix will be synchronized with motion picture and/or video images. Another practical reason refers to the song key: musicians can experiment with the song's key and arrangement against the basic rhythm track. Also, though the drums might eventually be mixed down to a couple of tracks, each individual drum and percussion instrument might be initially recorded to its own individual track. The drums and percussion combined can occupy a large number of tracks utilized in a recording. This is done so that each percussion instrument can be processed individually for maximum effect. Equalization (or EQ) is often used on individual drums, to bring out each one's characteristic sound. The last tracks recorded are often the vocals (though a temporary vocal track may be recorded early on either as a reference or to guide subsequent musicians; this is sometimes called a "Guide Vocal", "Ghost Vocal" or "Scratch vocal"). One reason for this is that singers will often temper their vocal expression in accordance with the accompaniment.
For classical and jazz recordings, particularly instrumentals where multitracking is chosen as the recording method (as opposed to direct to stereo, for example), a different arrangement is used; all tracks are recorded simultaneously. Sound barriers are often placed between different groups within the orchestra, e.g. pianists, violinists, percussionists, etc. When barriers are used, these groups listen to each other via headphones.
- Martin, George (1994). All You Need is Ears. St Martin's Press. p. 304.
- Ross Snyder interviewed by Howard Sanner about the history of Les Paul's eight track Ampex 300 and Sel-Sync, 11 Mar 2000
- Prince - School Of Funk from Modern Drummer Magazine. Accessed July 14, 2010
- Multi track machine
-  "All You Need is Ears" by George Martin, P. 148-157
- The History of Magnetic Recording
- Recording Technology History
- Der Bingle Technology
- "Both Sides Now" webpage on Ampex Records
- AES Historical Committee: Ampex History Project