This cool guy is John Rabe. As host of KPCC-Pasadena’s “Off Ramp,” Rabe captures a mixed bag of hip stories in radio’s radiant realm as they tumble forth in the wee village of Los Angeles. This Saturday, March 8, at high noon, on 89.3 on your FM-radio dial [repeats Sunday 6 pm] Rabe’s “Off Ramp” ...