Micromachine V3

Hi all, So I use retroarch on archlinux, I use pcsx-rearmed, because the other cores do not work on my computer (i do not know why)

So my problem he, is that spécificly the game “micromachine V3” on psx do not support multitap.

It work on crash kart, crash bash, and other games, but on micromachine V3, only the first controler have any answers in the game.

does somebody can help me ?