Re: Ringer volume
I may be mistaken, but I think you can use the volume knob. Just adjust it when it's ringing, like you do for nav voice, or radio volume.
Mine: 2014 Overland 4x4 V6, ORA II, billet silver/black, Michelin LTX M/S 2's, MaxCare Lifetime, delivered 4-13-'13
Wife's Jeep: 2008 Compass Sport 4x4, 2.4L I4 DOHC, CVT, Lifetime powertrain warranty