Generate pure audio frequencies online for music, sound testing and technical checks. This free frequency generator supports 20 Hz to 20 kHz, four waveform types, adjustable volume and stereo or individual-ear output. Use the 440 Hz preset as a musical reference, test headphones and speakers, investigate room acoustics or perform basic hearing self-checks while keeping volume at a com... https://aitoolspros.com/tools/audio/tone-generator/