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In page Drum machine:
"In 1975,[citation needed] Ace Tone released the Rhythm Producer FR-15 that enables the modification of the pre-programmed rhythm patterns.[4] In 1978, Roland released the Roland CR-78, the first microprocessor-based programmable rhythm machine,[5] with four memory storage for user patterns. In 1979, a simpler version with four sounds, Boss DR-55, was released.[citation needed]
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