Tutorial - add missing figure for section A.19

Thanks to @ethancrawford for the heads heads up that this was missing.
colba · Jun 15, 2020 · 45bce40 · 45bce40
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diff --git a/...l/articles/A.19-subtractive-synthesis/subtractive-synthesis-waveforms-large.png b/...l/articles/A.19-subtractive-synthesis/subtractive-synthesis-waveforms-large.png
diff --git a/...utorial/articles/A.19-subtractive-synthesis/subtractive-synthesis-waveforms.png b/...utorial/articles/A.19-subtractive-synthesis/subtractive-synthesis-waveforms.png
diff --git a/etc/doc/tutorial/A.19-subtractive-synthesis.md b/etc/doc/tutorial/A.19-subtractive-synthesis.md
@@ -85,6 +85,8 @@ quiet.
 
 ## Low Pass Filter
 
+![Varying amounts of low pass filtering](../../../etc/doc/images/tutorial/articles/A.19-subtractive-synthesis/subtractive-synthesis-waveforms.png)
+
 The low pass filter is such an important part of every subtractive
 synthesis toolkit that it's worth taking a deeper look at how it
 works. This diagram shows the same sound wave (the `:prophet` synth)