Frequency Generator Pro от Win79

Key Features:
Adjustable frequency from 0-2000 Hz
Volume slider
Sine, square, sawtooth, or triangle waveform types
Customisable minimum and maximum frequency
+- 1,10 and 100 Hz buttons

Background playback is not possible due to firefox extension permission limitations. However, if the tab that the extension was started on is left playing in the background and not minimised, the tone can continue playing underneath another window.

With the Frequency Audio Tone Generator, you can experiment with different frequencies, create ference tones, test audio equipment, generate calming sounds for relaxation and meditation or test your hearing range.