In a multimaster font if I use notations like the one below
=|n*0.6 (12)
for a sidebearing, the value is applied to all masters.
No way to get them independent.
It’s very painful 
This is on my list but not right on top.
In a multimaster font if I use notations like the one below
=|n*0.6 (12)
for a sidebearing, the value is applied to all masters.
No way to get them independent.
It’s very painful
This is on my list but not right on top.