I switch between various resources (AM/FM/SERIUS/Bluetooth) and it really grates me that if I want to optimize my listening I have to get in a fiddle with the Bass/Treble/Balance controls. Radio stations today have well defined formats just as SERIUS does. Why can't the settings for Tone/Balance be linked to the resource? The seems to me a rather simple bit of software to include in the package. I own some Bose products and have been very pleased with them so the only conclusion I can draw is that the people at Mazda who are managing the AUdio system integration just have never really used their own product.