Patent ID: 8865991

Claim:
A portable music player for the playback of a digital audio file, the music player comprising: a memory for storing a plurality of digital audio files; an audio output; a control for setting a desired change in one of pitch and tempo; a multifunction user interface; and a digital signal processor configured to (i) process a digital audio file and recover an audio signal therefrom, (ii) perceptibly alter one of the pitch and the tempo of the audio signal in response to the desired change in the respective one of pitch and tempo without perceptibly altering the other of the pitch and tempo, (iii) output the altered audio signal to the audio output, and (iv) automatically (a) start accepting an input from the multifunction user interface as the control for setting the desired change in one of pitch and tempo when the audio signal starts to be output to the audio output, and (b) after a predetermined period of time, revert to accepting the input from the multifunction user interface as another type of control for a previous purpose.