I first built a prototype to design the filters (or sound effects) I wanted to be able to apply to the sound. I made a webpage with this dropdown (from @DonKarlssonSan’s example) of all filters and sliders to represent the Freq, Gain, and Q values to determine what combination of variables I wanted for each button.
The Web Audio API documentation at MDN is excellent, thanks to @chrisdavidmills. I worked to redesign the Mozilla Developer Network documentation in 2012, so it is also rewarding to use a tool I've had a part in contributing towards.
Additional helpful links: