title
(this is abundant in aspire maps)

extremely slow slider, like 0bpm kind of slow. It's pretty much a can of worm on its own, so i'd rather let someone else who could explain this better, which i will drop their video below:



As a side note, you should check out how the .osu syntax work, particularly the timing points and the hit objects, because some parameters will play an important role on freely adjusting BPM or slider length without the restraint of the editor (you cannot go below 15bpm in editor for example)