For offset while beatmapping, see: Offset
Local song offset is an offset which moves the appearance of hit objects in relation to the audio of individual beatmaps. This can be helpful for players who experience auditory or visual delays. Local song offset works alongside the global offset to calculate a total offset.
At the start of gameplay, the local song offset can be changed by pressing:
+to increase the offset by 5 milliseconds
-to decrease the offset by 5 milliseconds
+to increase the offset by 1 milliseconds
-to decrease the offset by 1 milliseconds
If a local offset is defined, osu! will display the local offset in the interface above the scoreboard. osu! will also notify you of the local offset before starting gameplay.