Patent ID: 8912419

Claim:
A method for synchronized audio output between a first device and a second device, the method comprising: generating on the first device a first audio output corresponding to a primary track defined by a plurality of sequential audio data elements and one or more first playback synchronization identifiers stored together and associated with specific audio data elements at spaced intervals of the sequential audio data elements of the primary track; transmitting, to the second device, synchronization commands corresponding to the first playback synchronization identifiers as playback of the primary track on the first device advances to those specific audio data elements that include the associated first playback synchronization identifiers; generating a second audio output of a secondary track on the second device in synchrony with the first audio output on the first device, the secondary track being defined by a plurality of sequential audio data elements and one or more second playback synchronization identifiers stored together and associated with specific audio data elements at spaced intervals of the sequential audio data elements of the secondary track, relative positions of the first playback synchronization identifiers and the second playback synchronization identifiers along the sequential audio data elements of the respective primary and secondary tracks are substantially the same; wherein synchrony between the first device and the second device is maintained with the transmitted synchronization commands independent of any internal clocks of the first device and the second device, playback of the second audio output being adjusted to a specific one of the sequential audio data elements with the associated second synchronization identifier as directed by the synchronization commands from the first device.