the modular synthesizer had an arp module, allowing it to play chord patterns which were impossible beforehand
"an arp, short for arpeggiator, is a device that causes a synthesizer to play the all of the notes in a chord in an [arpeggio], rather than in harmonies
"the modular synthesizer had an arp module, allowing it to play chord patterns which were impossible beforehand" What is the definition of "arp"?