A return of energy due to the wave striking some discontinuity in its supporting medium.
"I JUST received the wonderful CD transfer of Frisco Joe's Good Time Boys "Barefoot Days" and "How Y'a Gonna Keep 'Em Down On The Farm", and I couldn't be MORE pleased! What an AMAZING job you folks did!!!!!!!!!!!! I'm already putting together my next order. How you got all that surface noise to disappear, I'll never know. It truly is like a ..."