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Non-ideal pulses varied according to strength or Accents , which produce two or three pulse pulse groups (anything larger being a combination), strong-weak and strong-weak-weak (ibid). In fact, given an ideal pulse, the most probable reaction for one to have is to perceptually group or differentiate the beats. A pulse which became too fast would become a drone, a pulse that is too slow becomes isolated sounds. A pulse that is regularly accented is a Meter . An isochronal or equally spaced pulse on one level that uses varied pulse groups (rather than just one pulse group the whole piece) create a pulse on the (slower) Multiple Level that is non-isochronal (a stream of 2+3... at the eighth note level would create a pulse of a quarter note+dotted quarter note as its multiple level). Pulse groups may further be distinguished as Synchronous , if all pulses on slower levels coincide with those on faster levels, and Nonsynchronous , if not. See also Source
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