Be sure to check out the 3030 Resource Center for some great info on the CTX. You can thank Digger and GateKeeper for collecting and compiling a great resource for everyone to use. Keep in mind that the programs that individuals have for their machines are adapted to their area and may have to be "tweaked" to work well with your particular soil and environment. If nothing else, it will give you a good idea on how you can customize a program to fit your needs and that of your surroundings to make the best of the machine.
It will take some time to learn the language of the CTX, but, once that is accomplished, you will have the best machine available to you!! Don't get discouraged, if the signal is questionable, dig it! Be sure to hit both axis, x and y and try to keep track of what you get with a particular signal. You will soon be on your way to knowing what it is telling you. Also, don't forget target trace......it will often lead you to a very worthwhile second or third target that would have gone unseen on other machines!
If you have questions, be sure to post them........lots of resident gurus on the CTX here and they are all willing to help!!