What is the difference between the symbol in the upper-left corner (with no arrow) and the one next to it (with an upwards arrow)? Aren't the two the same?
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That diagram looks like it came right out of Musescore. – Dekkadeci Feb 16 '18 at 20:51
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That could be possible. That was one of the first images I saw on google. – Stallmp Feb 16 '18 at 20:52
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The first two both mean to roll upwards. The third means roll downwards. The second is often used when the third is used to make it direction clear.
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I really like the terminology you used, "to ROLL upwards/downwards". Sounds very majestic! – Stallmp Feb 16 '18 at 20:45
