Does any owner who has the Beats Audio System fitted know if there any way of adjusting the sound level of the Sub Woofer? The radio settings do not list the sub woofer in the Fader settings and there is no information about Beats Audio in the manual. The Seat main dealer thought it was in the radio settings menu but on checking found it was absent on the Arona. Seat UK technical told me to visit my main dealer. It seems little point in carrying round this large speaker that only works when the volume level is at max.