I am not sure how much you are willing to wager. You have to know how your state pics the number. If you know as much of the statistics as possible, it makes picking the number easier. For example, if a double falls in the pic 4, 2 of the 3 digits will fall in the new few days. Now you have two pairs to work with. If this is true in PA, you can use this with some of the previous methods to reduce the amount of numbers to play. I hope it works for you.
In pick four, it is important to do your homework. Another method that works is to know which vtrac hits the most in your state. One of the vtraks that hit in MI is v1234. You can use the due pairs to make numbers and only play this vtrak. I hit a lot using this method. For example, last week in MI, I knew the pair 01 was due; I also knew vtrak v1234 had not fallen recently and was due as well. Therefore I made my combos. 0182, 0187, 0132, 0137, ouila! box hit 0182. Thanks for this post because now I will try a couple of the methods on here as well to see if they will work for me.
There is a section on vtraks in this forum to teach you more about them.
The key is to have an open mind and backtest everything in your state, before you wager your money. Once you do your homework and it works, go for it.