Spoken Instructions
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This image is black on the left, progressing to pure red on the right.
bviTouch uses the volume of the tones to indicate the relative brightness of the colors.
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Place your finger on the left of this image and move it to the right to hear the volume increase
that indicates the brightness of the red color.
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Swipe right to move to the next image, or left to move to the prior image.,
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