Got ready to make some backup music but can't find anything but a small set of chords that won't even allow a simple 3 chord blues song unless it is in the key of C. Where are the rest of the chords like A major? B etc. Do u use what is there then transpose? I don't see that either. Is this App just a lil demo of the real thing?

I'm guessing you are using the smart instruments.

To change the key, tap the wrench icon at the top right. There are several options, including the key. Each key has a different selection of chords to use.

If you are using the smart guitar or smart bass in note mode, you can also change the scale. It's a semi-transparent tab at the top right of the strings.

These settings can also be found on the non-smart instruments. Experiment with them to see what they do.