Generate accurate test tones with a free online frequency generator for music tuning, speaker testing, headphone evaluation, room acoustics, subwoofer checks, and audio troubleshooting. Select frequencies from 20 Hz to 20 kHz and choose sine, square, sawtooth, or triangle waveforms. Use stereo, left, or right channel playback, convenient frequency presets, or the 15-second logarithmic... https://aitoolspros.com/tools/audio/tone-generator/