> advantage of letting you listen back to the recording *from 
  > the tape*, the instant after it's been made.  It makes 
  > calibration of head alignment, metering, bias, etc. much 
  > easier.
So basically, a 3-head unit is better in terms of efficiency and
convenience (doing everything in one step).  Is there any difference
in terms of recording quality?
MI> Ferrichrome *was* "Type III".  I've actually seen one or two high-end 
decks 
  > that had a setting for it, but good luck ever actually 
  > finding the stuff.  I guess it just never really caught 
  > on...
What exactly is Ferrichrome?  Fe2Cr3?   Maybe it never caught on 
because they ran out of holes to punch on the rear of the tape.  :)
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