[frogs] Issue 1278

[Felipe Gonçalves Assis <felipeg.assis@xxxxxxxxx>]

Hello,

I would like to help solving Issue 1278 (arrow notation for quarter tones).

I understand that it is one of low priority and just an enhancement. I am
also aware that the development is currently focused on getting 2.14 out.
However, I believe this is a good opportunity for me to contribute since
it is something I could reasonably grasp.

I have written a patch that might be of interest. It addresses the issue
by changing the LilyPond representation of alterations to a pair of
integers,
with no implied pitch values, as suggested by Hans Aberg
(http://www.mail-archive.com/lilypond-devel@xxxxxxx/msg30877.html).

I believe this to be at least a concrete starting point. Even if we decide
for
something different, I could be of assistance, both in discussions and
code-work.

The help I would need back from more experienced developers would be
mainly in:
  * Discussion of some design decisions;
  * Some clarifications on regression tests;
  * Writing convert-ly rules;
  * Kind reviews of my Scheme code.

By the way, with regard to my qualifications, I think it is important to
say that I speak C++ natively, but have just learnt enough Lisp/Scheme/Guile
to make the mentioned patch work. Also, I am familiar with basic music
theory, but everything I know about quarter tones arrow notation comes
from the feature request. Finally, I am new to git, but with that I am
getting along pretty well.

I look forward to hearing from you.

Best regards,
Felipe
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