Generate precise audio frequencies online for music tuning, speaker testing, headphone checks, and sound troubleshooting. The free tool covers 20 Hz to 20 kHz and offers sine, square, sawtooth, and triangle waveforms. Use the 440 Hz preset for musical reference pitch, select individual left or right channels, adjust volume, or run a full frequency sweep through the audible range. https://aitoolspros.com/tools/audio/tone-generator/