Mirror — Iidx Bms

resources/README.md at master · BMS-Community/ ... - GitHub

In this context, the term "Mirror" usually refers to one of two things: File Repositories (Mirrors): Iidx Bms Mirror

The "Mirror" modifier flips the note lanes horizontally. While most IIDX players prioritize the "Random" modifier to build reading skills, the Mirror option is frequently used for "scratch-heavy" songs where the default layout might be uncomfortable for a player's specific hand-positioning. The Role of BMS in IIDX Mastery resources/README