Use a free online tone generator to create accurate frequencies for music tuning, speaker testing, headphone checks, room acoustics, audio troubleshooting, and hearing self-checks. Generate tones from 20 Hz to 20 kHz with sine, square, sawtooth, or triangle waveforms. Select stereo, left, or right channel output and use the 15-second frequency sweep for convenient audio testing direct... https://aitoolspros.com/tools/audio/tone-generator/