I have two questions about harmonics.
First one is about harmonicByRatio.  I've seen in the command index that
it is undocumented (like harmonicByFret).
There's an explanation here:
http://lilypond-s-support-for-tablatures.3383434.n2.nabble.com/harmonics-in-tablature-td5518526.html
 

But it's a bit difficult for me right now.
Can you help me?

Also, I've noticed that \harmonicsOn works only in Staff and not in
TabStaff.  There's a reason for this behavior or it's a bug?

Finally, after calling \harmonicByRatio the following harmonics are
raised by one octave.  Again, a bug or I'm missing something?

You can see everything in the attached example.

Thanks in advance,
Federico
\version "2.15.0"

music = \relative c'' {
   % Ok, it works in Staff and TabStaff
  <b\2\harmonic>2 <e\harmonic>

  % it works on Staff only: bug or what?
  \harmonicsOn
  b2\2 e
  \harmonicsOff

  % harmonicByRatio
  <d\3\harmonic>1 % almost right, but I'd like to play the same harmonic on the 7th fret
  % let's try
  \harmonicByRatio #1/3 d\3 % TabStaff ok, now the pitch in Staff is wrong

  % harmonicsByRatio "breaks" following harmonics (one octave higher)
  <b\2\harmonic>2 <e\harmonic>
}

\new StaffGroup <<
  \new Staff { \clef "G_8" \music }
  \new TabStaff { \clef "moderntab" \music }
>>
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