[bmah]

Offsets slightly differ from one computer to another, or even within the same computer, depending on what setup you're using.

For instance, my laptop's offset is different from the old desktop I used to work on. But the offset is also different when I plug my earbuds/headphones into the laptop and work from there. Similarly, if you got a different keyboard that has thicker keys, that'll also affect the timing of the arrows you press - according to your fingers and reaction.

Nevertheless, if the timing is so far off that it's unplayable, that file can be rejected. I think it should be fairly obvious when the timing's blatantly incorrect, so it's your own responsibility to fix that. @yo man im awesome: use your own judgment