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A song has notes on specific beats, and the editor should account for that. |
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Chart format: |
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First line contains a BPM setter. |
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BPM setters have a millisecond value followed by a decimal number (Comma-separated). |
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The millisecond value indicates where in the song the BPM should be applied to. From that point forward, |
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every note will reference to this new offset until either the song finishes or a new BPM setter is applied. |
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Example: |
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170,140 |
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A BPM of 140 will be set starting at 170ms into the playing of the song. At 140 BPM, every second references |
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~2.333333 notes, or ~428.57ms. |
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A note is defined as: |
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The lane it's located on (0-8) |
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The type of note (NORMAL or HOLD) |
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The start point of note in relation to the current BPM setter. |
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The end point of the note in relation to the current BPM setter (-1 for a NORMAL note). |
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The starting point of a note in relation to the current BPM setter is defined as follows: |
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Assume that an integer indicates how many beats within that BPM section we are in. |
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So Beat 0 is moment 170, Beat 1 is moment 170+428.57, etc. etc. |
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In this manner, we can easily adjust all the beats based on offset should we need to fix the BPM setter later. |
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Everything just shifts with it but stays on beat. |
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The only tricky part is defining non-aligned beats. |
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For eighth notes, we will use 0.5. So a note on Beat 3.5 is an eighth note right after Beat 3. |
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Sixteenth notes use 0.25. |
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For triplets, use 0.33333. There will be some precision loss, but we will use 0.33333,0.66667,and 1.0 respectively. |
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For sixteenth triplets, use 0.01667,0.33333,0.5,0.66667,0.83333,1.0 |
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If a note uses something that is not one of these values, it is likely unsnapped. |
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Every note will be given a color (DDR style) |
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- Quarter notes are red. |
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- Eighth notes are blue. |
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- Sixteenth notes are yellow. |
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- 1/6th notes are purple. |
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- 1/12th notes are green. |
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