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New England Digital modified their Synclavier digital synth to perform sampling , while E-mu Systems introduced a less costly sampling keyboard , the Emulator , in 1981 .
 New England Digital, E-mu Systems
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 New England Digital, E-mu Systems