Make sure they are not off-beat or off-tune, they have to follow the BPM and Key. Some of the other stuff that are marked as "???" is a sound I can't choose from. I would make the sounds for myself, but I'm not good at doing it because some will sound off-tune or off-beat. If you have Blandlab or FL Studio, you can make these sounds.
Incredibox belongs to So Far So Good Credit goes to Roblox, Incredibox, So Far So Good, Everyone and All Don't Report and No Offense...
