Not really. We've tried, where possible, to mimic the behavior of actual Winamp, and assumed that those who are looking for the feature would be familiar with the Winamp controls.

To quickly answer your question (for you) you can focus the Butterchurn window and press "L". From there arrow keys and enter are your friends. There are more controls too but, like you said, they are poorly documented.

Out of curiosity, where did you look when you were looking for documentation? Maybe that can help us understand where we should be putting these things.

FYI @jberg

Thank you for the information! I hardly remember the interlace for using Milkdrop in the past, so I did not know the shortcuts.

I've looked at

• webamp README: no information, except "We intend to make this part of the public API soon"
• the twitter thread mentioned therein ("Check out this Twitter thread for an illustrated list of features"): It does not mention MilkDrop
• Github issues: here I found that indeed it is possible to navigate presets, but it is never mentioned how (I suppose everybody in the conversation know how to)
• Finally, I went to winamp documentation. I did found some shortcuts ( not "L") that did not work, so I gave up.