Accessory Voltage Controller

I have received a number of suggestions as to how to fine tune accessory voltages on the electrical forum.  Thanks to all. Will advise which methods I use.  My current quandry is determining what use I can make of an Accessory voltage controller I bought

probable ten years ago and never used.  I downloaded the owners manual from Lionel and have read it several times.  I have found a number of questionable statements and important omissions in the manual as to how to install and operate this controller.  I have e-mailed my questions to Lionel with no response to this point.  No one on the electrical forum has mentioned any experience with this device. Am I the only sucker who ever paid over $100 for this paperweight?  IF THERE IS ANYONE WHO SUBSCRIBES TO THIS FORUM WHO KNOWS HOW THIS THING WORKS, PLEASE CONTACT ME.  Obviously this unit never gained much popularity since I have never seen one referenced in any post, and it seems to be the only TMCC accessory device which has not been the subject of a Utube video in Lionel's series.  It was shown in an overview of TMCC control devices, but is the only device which was never made the subject of a video.   Please help if you can.