Add waveform graphics
diff --git a/docs/resources/32blit-audio-saw.png b/docs/resources/32blit-audio-saw.png
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diff --git a/docs/resources/32blit-audio-sine.png b/docs/resources/32blit-audio-sine.png
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index 0000000..55d00bf
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+++ b/docs/resources/32blit-audio-sine.png
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diff --git a/docs/resources/32blit-audio-square.png b/docs/resources/32blit-audio-square.png
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index 0000000..0dc0434
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+++ b/docs/resources/32blit-audio-square.png
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diff --git a/docs/resources/32blit-audio-triangle.png b/docs/resources/32blit-audio-triangle.png
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index 0000000..7095ed6
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+++ b/docs/resources/32blit-audio-triangle.png
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