By Denny Dyroff, Entertainment Editor, The Times Smooth Hound Smith Smooth Hound Smith, which is headlining a show at Boot and Saddle (1131 South Broad Street, Philadelphia, 215-639-4528, www.bootandsaddlephilly.com) on September 23 is like an Americana band with balls. The band, which was founded by Zack Smith (guitars/vocals/foot drums/harmonicas/banjo) and Caitlin Doyle-Smith (vocals/percussion),...