Wondering if there is an app / way to boost overall output volume? (As in go past max volume factory settings) ... So far the only apps I have been able to find are only compatible with music already in your iphone library, and you are stuck only being able to play music from that app --- Nothing that works with spotify in particular. Looking for an app where you can just turn volume past max, toggle to spotify, and have output volume that is past max factory settings good for any output sound coming out of the phone. Looking for that extra bit of boost when I'm cruising with the windows down!