In branding and core functionality, iP76 is a sequel to the ColorTunes/GlowTunes speakers iHome has released in years past, but it’s so different from its siblings that it’s not really in the same genre. Prior designs such as 2009’s cube-shaped iH15, 2011’s iA17 and 2012’s iP18 were small and designed to sit on a nightstand, providing a little colorful light alongside a bed. iP76 is five or six times the size, and…