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 ## 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)