to use custom expressions, choose a replacement for classic red harlow.

copy the name of the ymt file you have chosen. as an example, I will be using the rio donkey rider replacer.

if you have a modded metapeds.ymt, open it. if you don't have one, use the unhashed one i have provided.

search "u_m_m_riodonkeyrider_01." under this you should see "<ExpressionSetName>expr_set_bcustom</ExpressionSetName>"

replace expr_set_bcustom with EXPR_SET_MP_BCUSTOM

save your new metapeds.ymt to lml/replace/update_4/x64/packs/base/data

