First off, which do you want: angle brackets ("⟨" and "⟩") or a
less-than and greater-than sign used as brackets ("<" and ">")? The
solutions are different. To wit...
The first (true angle brackets) are math-mode delimiters and as such you
have to be in math-mode to enter them in TeX. To do this put
"<v>$\langle$</v>" and "<v>$\rangle$</v>" in your gabc file (the "$"
signals TeX to switch in and out of math-mode, the verbatim tags tell
gregorio not to mess with the backslash, which it would otherwise treat
as a special character).
I've found that accessing the second requires a bit of legerdemain
because of font encoding. The default font encoding is OT1, which means
just putting a less-than or greater-than sign in the gabc, even when
enclosed in verbatim tags, results with "¡" or "¿" appearing
(respectively), as you saw. To fix this there are several options:
1) Switch your font encoding to T1 by adding "\usepackage[T1]{fontenc}"
to your TeX file or by switching to a font which already uses that encoding.
2) Make use of "<v>\textless</v>" and "<v>\textgreater</v>" in your gabc
file. These commands will insert the correct characters regardless of
encoding.
3) Access the symbols as math-mode binary operation symbols by using
"$<$" and "$>$" in your gabc file. Since none of these characters is a
special character for gregorio, you don't need the verbatim tags in this
case.
4) Switch to the typewriter font (which uses the T1 encoding) for these
characters: i.e. use "<tt><</tt>" and "<tt>></tt>" in your gabc file.
These characters will be slightly different from the ones above (since
they're in a different font) but the difference is not extreme.
✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝
Br. Samuel, OSB
(R. Padraic Springuel)
PAX ☧ ΧΡΙΣΤΟΣ
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