Overview
Hover or keyboard focus previews a help panel. Click or tap to keep it open while reading; activate the same button again, choose Close, press Escape, or select outside the panel to dismiss it. On smaller screens, explanations expand in the page or panel so they do not cover neighboring controls.
Tab moves between controls. Buttons can be activated with the keyboard, and native sliders/selectors support keyboard operation. Close buttons and Escape dismiss the relevant help/dialog where supported.
The waveform canvases are visual teaching displays. Use the textual summary, explanations and reference pages as complementary information; the site does not claim a complete nonvisual reconstruction of every waveform.