 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.A patch, or single sound, in the JD-800 consists of up to 4 tones.