Use a free online tone generator to create reference pitches and test audio equipment across a wide frequency range. Generate tones from 20 Hz to 20 kHz and choose sine, square, sawtooth, or triangle waveforms. The tool includes useful presets such as 440 Hz and 1 kHz, stereo or individual channel output, adjustable volume, and a 15-second sweep for checking speakers, headphones, room... https://aitoolspros.com/tools/audio/tone-generator/