I have a sena 20srl on my shoei.  I would love to have the feature to where you could say, "volume plus, or volume minus, or up or down.  I hate fumbling with the buttons.  I actually don't use them because they are so close together.  With gloves and my fat fingers.... You know.  Turning up the volume 99% of the time turns the helmet off because it hits both the center and + buttons causing shutdown