High Frequency Sounds ProBy Yuji Hayamizu ( Free )
This application is a generator of high frequency sounds for professional.Choose from 42 different frequenciesThis app can play 10Hz, 15Hz, 20Hz, 25Hz, 30Hz, 35Hz, 40Hz, 50Hz, 60Hz, 80Hz, 100Hz, 200Hz, 300Hz, 400Hz, 600Hz, 800Hz, 1KHz, ...