Hello everyone.
Here's a link to an online waveform generator, which you can use on your mobile phone. I sometimes find it very useful for making adjustments and checking low-frequency equipment without having to carry a waveform generator to the test site.
The generator is online and completely free, and no registration is required. It generates signals from 1 Hz to 20 kHz and can produce square, triangle, sine, and sawtooth waves.
Link to the site:
https://audiogen.rf.gd/