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For fun and profit I'm typesetting the first 4 chords the book I'm reading to learn the guitar recommends practicing, however I find hard to change the size of the diagrams, so they are very visible on the paper and I don't have to squint my eyes.

Here is my code so far:

\documentclass{article}
\usepackage[a6paper]{geometry}
\usepackage{gchords}
\usepackage{guitarchordschemes}
\thispagestyle{empty}
\begin{document}
\setchordscheme{
  x-unit=10cm,
  y-unit=20cm,
}
\def\numfrets{5}

\chords{
  \chord{t}{o,f2p2,f3p2,o,o,o}{E menor}
  \chord{t}{x,o,f2p2,f3p2,f1p1,o}{A mayor}
}
\chords{
  \chord{t}{x,f3p3,f2p2,o,f1p1,o}{C mayor}
  \chord{t}{x,x,f3p3,f2p2,f1p1,o}{F mayor 7}
}
\end{document}
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    You are using two distinct packages \setchordscheme is from guitarchordschemes but \chords and \chord are (probably) from gchords. The options from the former naturally don't influence the latter. – cgnieder Apr 7 '20 at 7:23
  • @cgnieder well, now I understand, but sadly I'm not capable of figuring out how to change any settings for gchords. EDIT: Just noticed that the PDF I was reading only groups a series of packages and that full documentation for gchords can be found here mirrors.ucr.ac.cr/CTAN/graphics/gchords/gchords_doc.pdf – shackra Apr 7 '20 at 16:27
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    BTW every package that is distributed with the main distributions has its own CTAN page: ctan.org/pkg/gchords Also you have the manual probably already on your computer, try texdoc gchords on the command line – cgnieder Apr 7 '20 at 16:49
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According to gchords documentation there is a command called \mediumchords which is a pre-defines a diagram size, for my use case, this works for me it is still too small on print meaning that some experimentation must be done.

You should check it's documentation: http://mirrors.ucr.ac.cr/CTAN/graphics/gchords/gchords_doc.pdf

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