My elderly husband adores Alexa, but has great difficulty with timing the pause between the wake word and the start of his request. No matter how often I remind him that he should not make his request until after he hears the 'bloop?' confirmation tone, he steps on the timing, and confuses her. He often gives up in frustration. An option for her to respond with "Yes?" instead of the tone would be so much more natural, and easier for him to work with. Because sounds are device specific, setting 'his' device to do this would not interfere with the more intuitive users/devices elsewhere in the house.