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Gradual BPM Change Calculator for Stepmania

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Post #1 · Posted at 2017-06-21 02:44:24am 1.9 years ago

Offline darkanine
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Last updated: 2018-04-22 11:27pm
This spreadsheet converts a gradual BPM change to individual BPMs that can be copied and pasted into the SM/SSC file under #BPMS. This calculator works for songs where the BPM gradually increases/decreases at a constant rate of BPM per Beat. It does not work if the rate is not constant. There are multiple sheets, so if someone is currently using a sheet, please use a different one.

Gradual BPM Change Calculator for Stepmania

Explanation
Initial BPM: The BPM at the beginning of the gradual BPM change.
Final BPM: The BPM right after the end of the gradual BPM change. This can be greater than or less than the initial BPM.
Initial Beat: The # of beats elapsed when the gradual BPM change starts.
Final Beat: The # of beats elapsed when the gradual BPM change ends.
Beat Interval: This is by preference. It determines the amount of beats between consecutive BPM changes. (Read below)

The beat interval determines the frequency of BPM changes. A shorter interval allows for increased accuracy during the gradual change but requires more BPM changes, while a longer interval allows for less BPM changes but sacrifices a bit of accuracy only during the BPM change (it will still be perfectly on-sync after the BPM change). However an beat interval smaller than 1/48 is not supported by Stepmania (and also really unnecessary).

Please give me feedback with any comments/concerns.

If you are curious how I made this, well it involved calculus, specifically integrals, and a lot of algebra. Dead

Post #2 · Posted at 2017-06-21 03:38:20am 1.9 years ago

Offline NewbStepper
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You programmed this on a spreadsheet? Nice! Let's see if this comes in handy sometime!
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Post #3 · Posted at 2017-06-21 04:25:36am 1.9 years ago

Offline darkanine
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It should! I remember around 3 years ago having to manually type each BPM out by hand for a 1 minute speed-up, only to realize that the sync fell behind the music along the slowdown since I did it wrong. Three hours wasted! Oops This should prevent any of you from making the same mistake.

Post #4 · Posted at 2017-06-21 04:27:10am 1.9 years ago

Offline NewbStepper
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Nice. Now, time to find a song that gradually speeds up...
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Post #5 · Posted at 2017-06-21 04:49:55am 1.9 years ago

Offline darkanine
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Last updated: 2017-06-21 04:54am
I encountered a bug that will be shortly fixed. Fixed. The initial beat being set to anything other than 0 would originally throw things off, but now it works properly.

Post #6 · Posted at 2017-06-23 06:34:58pm 1.9 years ago

Offline Suko
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I'm going to have to see if I can figure this out to correct my Country Roads stepchart.
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Post #7 · Posted at 2017-06-23 07:20:26pm 1.9 years ago

Offline richoskelter
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Excellent! Great job! :D
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Post #8 · Posted at 2018-04-22 11:24:42pm 1 year ago

Offline darkanine
darkanine Avatar Member+
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Last updated: 2018-04-22 11:24pm
Quote: Suko
I'm going to have to see if I can figure this out to correct my Country Roads stepchart.
https://zenius-i-vanisher.com/v5.2/viewsimfile.php?simfileid=31280
The tool should work as long as the song was produced electronically, or if its a live band recording, they used a metronome with a gradually increasing BPM. Otherwise there's no guarantee that the BPM increases as a steady rate.

Quote: richoskelter
Excellent! Great job! Big Grin
Thanks, hope it's helpful!

BUMP!
I updated the Groove Radar Calculator with a new feature! It can now tell you how long in seconds the gradual BPM change is from start to finish. This allows you to make sure the BPM change is the same length as it's supposed to be, so that way the simfile doesn't drift off-sync.

If you have any suggestions for other features to add, feel free to let me know!
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