Known issueFixUpdated · 3 replies on Steam
Piano Glow: Mania Mode Button Problem (Workarounds)
Short answer
No confirmed fix yet. Players suggest: It's a bit odd, perhaps update the keyboard drivers and update Windows to see if it helps.
The problem
Hey ive noticed in Mania with only 4 Keys (binded on G H J K ) if i hold G and H i cant press J but i can press K. Others have the same Problem? It doesnt matter how i bind them when i hold 2 keys one of the other 2 doesnt get triggered when i press them until i lett go another key.
What players suggest
It's a bit odd, perhaps update the keyboard drivers and update Windows to see if it helps. Otherwise it might be a very odd limitation of a very old keyboard.
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Source: original Steam Community discussion. Quotes are shortened; all credit goes to the posters.