What was a very good tool with intuitive interface, now is very buggy and has added stop/play buttons for more steps to go through. The sine wave tone generator only works intermittently, there is a delay when "X"-ing out of a screen (also a new added step), and my iPhone 5s gets hotter than a mother and will drop the battery from 100% to 70% in about 10 minutes of "trying" to use the tool. Im on iOS 9.0. Do not purchase this tool if you are looking - it used to be great, then they updated it to what is now an alpha version - worthless garbage.
ortofon2m about Audio Tool, v2.0