BMS/Beatmania songs are generally 8 key (or #K+1).
These games both have an option (mod in osu! terminology) called Auto-Disc, or something like that, were the final 8th key (aka disc) is automatically pressed for you without the user having to input the particular key.
What it boils down to would be that you're playing a 7 key style but on an 8 key map as the computer would do the final key's input for you. Basically a leisure mod and it would be nice if there was a auto-disc mod for iidx layout maps on osu!mania.
These games both have an option (mod in osu! terminology) called Auto-Disc, or something like that, were the final 8th key (aka disc) is automatically pressed for you without the user having to input the particular key.
What it boils down to would be that you're playing a 7 key style but on an 8 key map as the computer would do the final key's input for you. Basically a leisure mod and it would be nice if there was a auto-disc mod for iidx layout maps on osu!mania.