Reaticulate_Activate next articulation in group 4 on default channel.lua

cmdlist = reaper.GetExtState("reaticulate", "command")
cmd = ' activate_relative_articulation=0,4,2,127,1'
reaper.defer(function()
    reaper.SetExtState("reaticulate", "command", (cmdlist or '') .. cmd, false)
end)