Overpriced
Although the user interface is fine and there are more modes included than most people will ever use, don't expect this app to 'magically' teach you the modes. At $5 this would have been good value. At $20 it's way over priced. I admit that I mistakenly thought that something so expensive had to be great. Don't make the same mistake that I did. Google 'bass modes' or buy a book instead.