I've tried the vol. all the way up and can't get the "loudness" I'm used to. Sens. on 6. Is there something I can do, maybe on the phones, to coax a little more volume? Unit pairs with no problem. Nothing was sent with the phones to describe the functions of the lights, connector holes, buttons. Got most figured out but is there another function for the white light? What's the purpose of the 1/8 " connector hole below the white button? A purpose for the small white light next to the power input socket? I've probably overlooked something which would not be unusual. Any help is truly appreciated. ws