[Again he'll just shake his head, setting his own phone down on the seat he had been using before, letting the call remain connected so they can test things without having to call each other again.]

Let's see...was it this button?

[After turning the phone around for a second, he finds the two side buttons and presses one.


Which only turns the screen off. Nope, not that one... Another click of that button turns the screen back on, and so he tries the longer one. Seeing the bar appear with it going up and down (what were those symbols again?), light flashes in his eyes with a grin.]

Think I got it. You press this button here—goes up and down. Up is louder, down is quiet.