I wanted to be sure and tell you that the code you provided is the one I was able to install, modify to suit my needs, and with a bit more tweaking I think will be my solution.
I have added digital inputs to the structure and they are being recorded in conjunction with the analog value. As soon as I went back and added the inputs to the ADD function as you suggested everything started humming along.
A lot of others provided their code and memory usage insights and I appreciate everyone's generosity to share. 