[I split this earlier thread into two: New CV plugins: Slider Buttons and CV Curve (.mk in mod-plugin-builder) ]
@zwabo found a bug with “CV Curve” where after assigning the CV port a label it was hard to read. This should now be fixed. I wasn’t able to find the issue where you weren’t able to assign its variable to a plugin parameter and save it. If you could give me more details that’d help.