Thanks for the compassion, khutch. And, in response to the post khutch was responding to, there is no 'middle' position to the switch, as I think I already stated. If there were, I'd set it and forget it, but one is 'forced' into deciding since the switch is only 600 or 250, resulting in the need to know at least what the choices mean. On certain settings, you just cannot hear the difference, so it's almost like this info is needed as context in order to begin figuring out what to do. Thanks for the comments.