The question is, SHOULD you use it. Without looking at the manual, I am guessing it is a gate(Rather than a true expander which IMO is slightly more useful) both of which will lower levels when a signal is below a certain threshold. This CAN be useful on buzzing guitar amps to lower levels when they are not being played, it can also be useful on drums to lessen the issues of blled in close mic'd drum kits, and can be useful in other circumstances. But using it just because you have it is the wrong answer. Identify a problem, then see if it is the right answer, don't look for a problem to solve with it.
Besides a little buzz from the guitars I do not think I need it.
I would say the previous suggestions of going off of CD at this point do make sense, though I do still spec a CD recorder in systems I design for houses of worship in most cases. Thing is they use the Solid State recorders far more than they do the CD recorders, and use the CD recorder only to transfer onto CD when they need to.
That being said, you won't find a decent recorder of any type cheap, and chances are you won't find a CD recorder that is a multi disc tray mechanism at all. Are you looking for a rackmountable unit? What inputs does it need? Does it need to always start recording at a set time, or will you be starting it manually each time? These are all questions that need to be answered in order to give you a proper suggestion.
I would prefer a rack mountable unit. I will manually start the recording when it is time. It needs to have an output/input audio jacks, because we play a lot of CD's before and after the service.
Is their another easier way to record sermons? As I wont have access to a computer to record. All I need is to be able to make one master copy then take it home and upload to the internet. I would do all burning and what not from my home computer.