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Convolution low-pass filter
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readme 

Keyboard keys:

GENERATOR/OSCILLATORS:
E:    Generate square wave
I:    Generate sine wave
N:    Generate noise wave
T:    Generate triangle wave

WAVEFORM ACTIONS:
A:    Average (convolution low-pass)
R:    Shuffle (randomize)
S:    Sort
O:    Rotate left

PARAMETER MODIFICATION:
+/=:  Increase filter cutoff frequency
-/_:  Decrease filter cutoff frequency
Up:   Increase generator frequency
Down: Decrease generator frequency