How could I create a map compilation like "Osu! Memories"? Some external program is needed to the notes or everything is done manually, ¿Cómo podría crear una recopilación de mapas como "Osu! Memories"? Se necesita algún programa externo para unir las notas o todo se hace manualmente.

I don't know how to do this, but according to this post, It will be unrankable, which is good to know, in case that deters you. It can probably still get Loved, as there are much less restrictions.