The challenge in teaching music to hearing-impaired elementary school kids, Benjeman L. Nichols knows, is replacing sound with motion. This was December 1999 — before Nichols moved to Germany the first time, before he was a Fulbright scholar, before he was married, before he had gone to law school, before he was a partner at personal-injury firm Cavanagh Law Group. After graduating from Valparaiso University with a degree in music education and humanities, Nichols headed to Chicago and sought a job teaching …