I tried it a few years ago and gave up primarily because I couldn't get it run. I eventually found you have to tell it how long to run and what freq, etc., etc.,

I never did find a book or website that dipped low enough to my level. We found a pot of money at work and I was able to purchase Proteus. It is pricey and takes some work to use effectively but I really like it. I never did find any mid level sim program.