I just purchased a copy of Don Brockway's DVD of Mechanical Music from
eBay.  This 1985 program contains an extensive interview with Harvey
Roehl and a survey of his collection, plus a guided tour and background
story of QRS from Bob Berkman.  It is excellent, both as an introductory
overview for the unfamiliar as well as a delightful immersion for the
true believers.  It can be found as eBay item 6467280415.  (Ignore the
number available; Don has more copies.)

Dan Harrett
dharrett@tir.com