Jesusonic And REAPER
From CockosWiki
Special Behavior of Jesusonic in Reaper
@serialize blocks do not work for user-written effects. This means that presets for user-written effects save the UI settings only, and not any other state (such as any buffer or map that was created while using the effect).
Otherwise Undocumented Jesusonic Features
Looking at the special variable trigger causes a set of 10 trigger buttons to be placed at the top of the UI. trigger returns 2^index for whichever trigger was pressed.