If you refer to the ENV/LFO then you can read it here:
https://lmms.io/wiki/index.php?title=In ... .2FLFO_tab
If you mean the LFA on the Controller-Rack, then it is here:
https://lmms.io/wiki/index.php?title=Co ... er_Rack%7C
If you refer to the ENV/LFO then you can read it here: