Use a free online tone generator to produce controlled audio frequencies for equipment testing, music tuning, speaker checks, headphone evaluation, and audio troubleshooting. Generate tones from 20 Hz to 20 kHz with sine, square, sawtooth, or triangle waveforms. Choose stereo, left, or right output, access useful frequency presets, and run a 15-second logarithmic sweep for convenient ... https://aitoolspros.com/tools/audio/tone-generator/