Don't Buy!
I am in an audio recording school and purchased this app. hoping to gain more responsive hearing to certain frequencies as I train my ear. This app. was useless. It does not do anything below 1K, or anything between 1k to 2k, or 2k to 3k.... and so on. You can only listen to 1k, 2k, 3k, 4k, 5k etc... up to 20k. That's it... Which for some old peoples advantage of figuring out if they can hear or not is...I guess, fine. Anyone who is serious about listening to or for certain frequencies, go to Studio Six Digital, and purchase the Generator app... It's amazing, and makes this app look even more sub-par. This app is worthless and should be free... this did not cost you anything to make and is so inefficient that you should remove the price, or the app such as not to waste more consumers money. Thanks!