Create and test audio frequencies with a free online tone generator built for speakers, headphones, music tuning, room acoustics, and sound troubleshooting. Generate frequencies from 20 Hz to 20 kHz and choose sine, square, sawtooth, or triangle waveforms. Test stereo or individual left and right channels, use preset frequencies for quick checks, and run a 15-second logarithmic sweep ... https://aitoolspros.com/tools/audio/tone-generator/