The main objective of Smacky is to provide basic features for writing music scores and emulating them on a speaker. All scores are described in a simple XML file like the following:
<?xml version="1.0" encoding="UTF-8"?>
<score tempo="150" name="My music score">
  <block loops="2">
    <block>
      <note value="C,4" />
      <note value="D,4" />
      <note value="E,4" />
      <note value="F,4" />
      <note value="G,4" />
      <note value="A,4" />
      <note value="B,4" />
    </block>
    <pause duration="3.0" />
    <block>
      <note value="B,5" />
      <note value="A,5" />
      <note value="G,5" />
      <note value="F,5" />
      <note value="E,5" />
      <note value="D,5" />
      <note value="C,5" />
    </block>
    <pause duration="3.0" />
  </block>
</score>
        
The syntax is relatively intuitive for beginners. This file format was almost chosen to ease the reading/writing of music scores for musicians and the sharing between users.