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Roland JD-800
The Roland JD-800 is a discontinued digital synthesizer. The synthesizer featured many knobs and sliders for patch editing and performance control - features which some manufacturers, including Roland, had been omitting in the name of 'streamlining' since the inception of Yamaha's DX-7. The JD-800 became very popular with musicians who wished to take a 'hands on' approach to patch programming.
In the introduction to the manual, it is stated that with this synthesizer, Roland intended to 'return to the roots of synthesis':
Today, fewer and fewer people actually create their own sounds, and simply play presets or sounds created by programmers.
However, the original purpose of the synthesizer was to "create sound". It's easy to simply select a preset you like, but that sound will always be "someone else's sound". We at Roland asked, "Why don't we return to the roots of synthesis; the enjoyment of creating original sounds?" We considered many different ways in which we could bring back the fun of creating sounds, and the result is the JD-800 before you.
"Creating sounds" may seem like a highly technical process, but it's actually just a matter of moving a slider to make the sound change! This is easy for anyone, and the sounds that you get will always be your very own.
The JD-800 is designed to make it fun to create sounds. So please go ahead and move those sliders! We hope you will make lots of different sounds; original sounds with which to play your original music.
—From the introduction to the JD-800 manual
== Technology ==
The JD-800 combines sample playback with digital synthesis, a process that Roland calls Linear Arithmetic synthesis, a technique Roland had been using to great effect in the Roland D-50. The JD-800 has 108 waveforms built-in, but these can be expanded via PCM-cards. There are waveforms in a variety of categories, like; analog synth, acoustic instruments, like guitars, woodwind, brass and voices. Most of these waveforms are very short and are designed to give character to the attack portion of a sound, while some longer ones are designed for creating pads, or the sustained part of a patch. The JD-800 was the first instrument from Roland to have its core sound set of waveforms developed entirely in the United States, under a short-lived branch of Roland's R&D-LA office in Culver City, California. The core sampled waveforms and Factory presets of the JD-800 were created by Eric Persing.〔http://www.spectrasonics.net/company/other/ep-roland.php〕
A patch, or single sound, in the JD-800 consists of up to 4 tones. As every tone consists of an almost completely independent synthesizer voice a patch could be considered a layer of up to 4 different synthesizers. In single mode the JD-800 plays one patch at a time, but in multi mode it is possible to play 5 different patches, over MIDI, plus an extra "special" patch. The special patch has different waveforms assigned to the 61 different key on the keyboard, so is used for drums and percussion sounds. The JD-800 has one effects section. In single mode 7 effects can be used simultaneously, in series, so all tones in a patch go through the same effects. In multi mode 3 effects can be used at the same time, all patches sharing the same effects, though a patch can be routed to bypass the effects.〔http://media.rolandus.com/manuals/JD-800_OM.pdf〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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