“How do you adjust the sleep mode or energy-saving turn-off mode? I had an MP3 player hooked up via the AUX for meditation. The audio track plays a few minutes at beginning with 50 minutes of silence then ends with some audio. During the 50 minutes of silence, the stereo unit turned off (i.e. went into sleep mode of sorts) so when the final audio tried to play from the MP3 player nothing came out of the speakers! The unit was shut off! There is no indication in the manual of how to adjust this "mode". Cool energy-saving feature UNLESS you don't want to use it!! : ) But it seems no way to control this "feature." Any ideas?”