osu!taiko SV Helper plus Manual

Features

Beatmap: Select or drag and drop a .osu file.
Start Point / End Point: Enter the time, Slider Velocity, and Volume for the edit range.
Include Start Time / Include End Time: Choose whether timing points exactly on the range edges are included.
Overwrite: Removes all inherited timing points in the selected range, then creates new inherited timing points. In normal Overwrite, points that would not change SV, Volume, or effects are skipped.
Modify: Modifies existing inherited timing points in the selected range.
Remove: Removes inherited timing points in the selected range.
Keep: Keeps the original inherited Velocity or Volume instead of applying the input value.
Dense Mode: Creates dense inherited timing points at 1/16 snap, 1/8 snap, or 1/4 snap. Dense Mode still places timing points even when the values do not change.
-1/16 Offset Mode: Places generated SV points slightly before the target object. When 1/12 snap notes are present, nearby notes also use a -1/12 offset. This mode is recommended when placing SV points with volume changes.
SV Mode: Selects how Velocity and Volume move from the start value to the end value.
Finisher Only Mode: Limits Overwrite and Modify to big-note/Finisher SV points. In Overwrite, when a Finisher changes SV or Volume, a restore point is placed at the next non-Finisher hit object or barline in the selected range. Consecutive Finishers are kept as one run, and this mode cannot be used together with Dense Mode.
Backup: When enabled, the app creates a backup folder in the local app folder and saves the original .osu file before applying changes. Use the Open Backup Folder button to view the backups. To restore a file, open the dated .osu backup file and copy its contents back into the original beatmap file.
Language / Manual: The app can switch between English and Japanese, remembers the last language, and opens this manual from the title bar.

Advanced Mode

Advanced Mode adds profile controls. A profile saves the current input values and options so the same SV setup can be reused later.

Save: saves the current values into a named profile.
Load: restores a saved profile.
Delete: removes a saved profile.
Profiles include the edit values, range options, Dense Mode snap, Offset Mode, Finisher Only Mode, SV Mode, Keep settings, and Backup setting.

Changes Added in plus

Fixed a bug where Modify and Delete could turn red lines into green lines.
Overwrite now works as a true overwrite. It removes all green lines in the selected range before creating new green lines.
Normal Overwrite now also creates SV lines on barlines. Barline positions are calculated from red lines using beatLength * meter, and the final timestamp is floored.
Dense Mode now supports 1/8 snap and 1/4 snap in addition to 1/16 snap.
-1/16 Offset Mode now includes the old 1/12 included behavior by default. When 1/12 snap notes are present, nearby notes also receive a -1/12 offset.
The 1/12 included behavior now also supports notes within ±1 ms of 1/12 snap.
Removed the Kiai option. Overwrite inherits Kiai/effects from the start point, and Modify preserves each green line's original effects.
Added small Keep checkboxes to preserve SV and volume independently.
Volume input is now limited to values from 5 to 100.
Added Finisher Only Mode. Overwrite and Modify can target only big-note / Finisher SV lines, and Overwrite adds a restore SV line after the changed Finisher.
In Finisher Only Mode, green lines are not added when SV, volume, and effects do not change.
Added the SV Mode dropdown. The default behavior is Linear / Arithmetic, and the old Exponential checkbox behavior is available as Cubic In / Accelerate Curve. Fixed-control-point Bezier modes, Bezier In-Out and Bezier Out-In, were also added.
When the selected range crosses BPM changes, generated SV values are now automatically BPM-compensated in all SV modes.
Added English and Japanese UI support, and the selected language is preserved for the next launch.
Added a manual link to the top of the app.
The app checks GitHub Releases at most once every 24 hours and shows a notice when a newer version is available.

SV Mode Formulas

Let the progress value be:

t = \frac{currentTime - startTime}{endTime - startTime}

Also let s be the start value and e be the end value. The normal domain is:

0 \leq t \leq 1

All modes interpolate from s to e. If the start and end values are the same, the value stays constant for the whole range, including the Bezier modes. The Bezier modes use fixed control points; they cannot be edited in the app.

Representative graph of Linear, Ratio, Cubic, and Sine SV mode curves

Representative graph of Bezier SV mode curves compared with Linear

Mode	Formula	Shape
Linear	$value (t) = s + t (e - s)$	Constant difference over time.
Ratio	$value (t) = s {(\frac{e}{s})}^{t}$	Constant ratio over time.
Cubic In / Accelerate Curve	$value (t) = s + t^{3} (e - s)$	Slow at the beginning, faster near the end.
Cubic Out / Decelerate Curve	$value (t) = s + (1 - {(1 - t)}^{3}) (e - s)$	Fast at the beginning, slower near the end.
Sine In / Smooth Accelerate Curve	$value (t) = s + (1 - \cos (\frac{t π}{2})) (e - s)$	Smooth acceleration.
Sine Out / Smooth Decelerate Curve	$value (t) = s + \sin (\frac{t π}{2}) (e - s)$	Smooth deceleration.
Bezier In-Out / Accelerate-Decelerate Curve	$value (t) = s + (0.30 {(1 - t)}^{2} t + 2.70 (1 - t) t^{2} + t^{3}) (e - s)$	Fixed Bezier curve with control values `0.10` and `0.90`. Slow at both ends and faster near the middle.
Bezier Out-In / Decelerate-Accelerate Curve	$value (t) = s + (2.70 {(1 - t)}^{2} t + 0.30 (1 - t) t^{2} + t^{3}) (e - s)$	Fixed Bezier curve with control values `0.90` and `0.10`. Fast at both ends and flatter near the middle.

When the selected range crosses BPM changes, generated SV values are automatically BPM-compensated. This applies to all SV modes. The app uses the start BPM as the reference:

correctedValue (t) = value (t) \times \frac{startBPM}{currentBPM}

For Slider Velocity, the inherited timing point beat length is:

beatLength = \frac{- 100}{correctedValue (t)}

For Volume, the value is rounded to the nearest integer.