Yamaha DX7
| Spec | Detail |
|---|---|
| Manufacturer | Yamaha |
| Year released | 1983 |
| Synthesis type | FM |
| Architecture | Digital |
| Polyphony | 16-voice polyphonic |
| Notable users | Brian Eno, Whitney Houston, a-ha |
| Known for | The best-selling synthesizer ever and the 1980s FM electric-piano sound |
Overview
The Yamaha DX7 is a digital synthesizer introduced in 1983. It was one of the first mass-market instruments to use FM synthesis, a method of generating sound through digital frequency modulation rather than the analog voltage-controlled circuits common in earlier synthesizers. The DX7 is a 16-voice polyphonic instrument, meaning it can play up to sixteen notes simultaneously. Its architecture is entirely digital, and it does not contain analog oscillators or filters in the traditional sense. Instead, its sound is produced by digital operators that modulate each other's frequencies. The DX7 became widely known for its bright, metallic, and bell-like tones, as well as for its electric piano sound, which became a staple of 1980s pop and rock music. It is often cited as the best-selling synthesizer ever made, though exact sales figures are not officially published by Yamaha. Its influence on music production is significant because it made digital synthesis affordable and accessible to a broad range of musicians. The instrument's interface, which relied on a single data entry slider and a small LCD screen, was initially seen as difficult to program, but its preset sounds were immediately usable. The DX7 helped define the sound of the 1980s and remains a reference point for digital synthesis.
History & design
Yamaha began researching digital synthesis in the 1970s, building on the work of John Chowning at Stanford University, who developed FM synthesis in the late 1960s. Yamaha licensed Chowning's patents and released the GS1 and GS2 digital synthesizers in the early 1980s, but these were expensive and not widely adopted. The DX7, introduced in 1983, was designed to be more affordable and portable. It used a custom digital signal processor (DSP) chip and a 12-bit digital-to-analog converter. The instrument has a 61-key velocity-sensitive keyboard, which was notable at the time because it allowed expressive playing. The DX7's design is minimalist: a dark gray or black metal chassis, a small backlit LCD screen, and a single slider for data entry. Programming is done through a membrane button interface that many users found cumbersome. However, the DX7 shipped with 32 preset voices stored in ROM, including the famous E.PIANO 1 sound. These presets could not be overwritten, but users could store their own sounds in RAM. The DX7 also included MIDI, which was standardized in 1983, making it one of the first synthesizers to feature MIDI implementation. This helped it integrate into emerging digital studio setups. Its lightweight design and reliable tuning made it popular for touring musicians. The DX7 was followed by several revisions, including the DX7II and the DX7S, which added features like stereo outputs and improved MIDI implementation.
How it works
The DX7 uses frequency modulation (FM) synthesis, a digital technique where the frequency of one oscillator, called the carrier, is modulated by another oscillator, called the modulator. In the DX7, these oscillators are called operators. Each operator produces a sine wave, and the instrument has six operators per voice. The operators can be arranged in different configurations called algorithms. An algorithm determines which operators modulate which others and which operators are carriers that produce the final output. The DX7 offers 32 different algorithms, ranging from simple stacks where one operator modulates another, to complex arrangements where multiple modulators affect several carriers. The amount of modulation is controlled by an envelope generator, which shapes the brightness of the sound over time. Each operator has its own envelope generator with adjustable attack, decay, sustain, and release rates. The DX7 also includes a low-frequency oscillator (LFO) for vibrato and tremolo effects. Unlike analog synthesizers, the DX7 does not use filters to shape the sound; instead, the timbre is determined by the modulation index and the operator envelopes. This allows for a wide range of sounds, from pure sine waves to complex, noisy textures. The digital nature of the DX7 ensures stable tuning and consistent sound reproduction. However, the lack of analog filters means that creating warm, subtractive-style sounds can be challenging. The DX7's synthesis engine is entirely digital, and its 16-voice polyphony was generous for its time. The instrument's output is monophonic per voice, but the overall output can be panned or processed externally.
Signature sound
The DX7 is best known for its electric piano sound, often referred to as the FM electric piano. This sound is characterized by a bright attack that quickly decays into a bell-like sustain, with a slight chorus effect due to the DX7's built-in vibrato and the way its operators interact. The preset E.PIANO 1 became ubiquitous in the 1980s, appearing on countless pop, rock, and R&B recordings. Another signature sound is the bass, which is deep and punchy, often used in funk and electronic music. The DX7 also excels at producing bell tones, marimbas, and metallic percussion, as well as brass and string-like pads, though these often have a distinct digital character. The instrument's ability to produce glassy, shimmering textures made it a favorite for ambient and new age music. Because FM synthesis generates harmonics that are not naturally present in analog waveforms, the DX7's sound is often described as cold, bright, or sterile compared to analog synthesizers. However, its clarity and presence in a mix made it a staple in professional studios. The DX7's velocity sensitivity allows for expressive dynamics, with harder key presses producing brighter, more modulated tones. This makes it suitable for lead lines and solos. The DX7's sound is also notable for its lack of inherent warmth; many producers added external reverb or chorus to soften it. The DX7's preset sounds were so widely used that they became clichés by the late 1980s, but they also defined the era's sonic palette.
Notable users & recordings
The Yamaha DX7 was used by a wide range of musicians across genres. Brian Eno, known for his ambient and experimental work, incorporated the DX7 into his productions, exploring its textural capabilities. Whitney Houston's music in the 1980s and 1990s often featured DX7 electric piano and bass sounds, contributing to the polished pop sound of the era. The Norwegian band a-ha used the DX7 extensively on their debut album Hunting High and Low, including the hit song "Take on Me," where the DX7's bright bass and bell-like tones are prominent. Other notable users include Herbie Hancock, who used the DX7 for its electric piano sounds, and Chick Corea, who explored its synthesis capabilities in jazz fusion. The DX7 also appears in the work of Depeche Mode, particularly on their album Black Celebration, and in the music of Kenny Loggins, whose hit "Danger Zone" features DX7 bass and brass sounds. The instrument was a staple in the studios of producers like Quincy Jones, who used it on Michael Jackson's Bad album. The DX7's preset sounds were so common that they can be heard on numerous chart-topping singles from the mid-1980s, including songs by Tina Turner, Phil Collins, and the Pointer Sisters. Its use in film scores, such as Harold Faltermeyer's "Axel F" theme from Beverly Hills Cop, further cemented its place in pop culture. The DX7 was also a favorite of electronic music pioneers like Jean-Michel Jarre, who used it in his live performances and albums.
Legacy & influence
The Yamaha DX7 had a profound impact on the music industry. It was one of the first digital synthesizers to achieve widespread popularity, and its success helped transition the market from analog to digital instruments. Its FM synthesis engine offered a new palette of sounds that were impossible to create with analog subtractive synthesis, inspiring a generation of musicians and sound designers. The DX7's preset sounds became so ubiquitous that they defined the sound of 1980s pop music, and its electric piano patch is still recognized today. The instrument's MIDI implementation helped standardize digital communication between devices, and its lightweight design made it a favorite for touring. However, the DX7's complex programming interface led to a cottage industry of third-party editors and sound libraries, and it also contributed to the decline of analog synthesizer manufacturers in the late 1980s. Despite its initial difficulty, the DX7's engine was later understood and exploited by programmers who created thousands of custom patches. The DX7's legacy includes its influence on later digital synthesizers, such as the Yamaha SY series and the Korg M1, which combined FM with sample-based synthesis. In the 2000s and 2010s, the DX7 experienced a revival as musicians sought its distinctive sound for retro and electronic music. Software emulations and hardware clones have been developed, ensuring its continued presence in modern production. The DX7 is also celebrated for its role in democratizing synthesis, as its relatively affordable price made digital synthesis accessible to a broader audience. Its impact on music technology is comparable to that of the Fender Stratocaster or the Roland TB-303, making it a true icon of electronic instruments.
Frequently asked questions
Q: What is FM synthesis and how does it differ from analog synthesis? A: FM synthesis generates sound by modulating the frequency of one oscillator with another, creating complex harmonics. Analog synthesis typically uses subtractive synthesis, where filters remove harmonics from a rich waveform. FM can produce bright, metallic, and bell-like tones that are difficult to achieve with analog. Q: Why is the DX7 considered difficult to program? A: The DX7 has a single data entry slider and a small screen, and its parameters are organized in a menu system that requires navigating through many pages. Unlike analog synthesizers with dedicated knobs for each function, the DX7's interface is not intuitive, and understanding FM synthesis requires knowledge of algorithms and operator relationships. Q: What are some common sounds associated with the DX7? A: The DX7 is famous for its electric piano, bass, bell, marimba, and brass sounds. Its preset E.PIANO 1 is particularly iconic, as are its bass patches and the glassy pads used in ambient music. These sounds are characterized by a bright, digital quality and often include a quick attack and a shimmering sustain.