If you're interested in audio, PortAudio is an established project with a lot of users. I have no doubt that the docs could be improved. I know this because I wrote a large chunk of the docs and I am frequently impressed by the docs of other projects. I'm not sure what the best way to improve them would be (improve structure? replace missing content? presentation? unify doxygen docs, README, and website, something else?). You could make an impact by reviewing our docs and posting your review as a GitHub ticket with a prioritised list of low-effort, low-churn, high-impact improvements. Even better if you submit some PRs. At the moment us maintainers have to allocate most of our limited time to maintenance.

Daily snapshot of the generated doxygen docs are here: https://files.portaudio.com/archives/pa_v19_doxydocs.tgz

website: www.portaudio.com

GitHub (including wiki): https://github.com/PortAudio/portaudio

I'd also like to make a general comment about "making an impact" on open source projects. There are many ways to help out on an open source project, but one good way is to maximise the benefit:maintainer-cost ratio. Maintainer cost comes in a number of forms: cognitive and time cost of reviewing PRs, engaging in design discussions, iterating on PRs, coordinating a "live" work in progress PR for long periods of time, you get the idea. With this in mind, I like it when the contributor owns the PR from submission to merge, don't just make the PR, help the maintainers get it over the line however is needed. A lot can be done by simply submitting PRs that follow project guidelines and established conventions, are targeted at a single improvement, making them uncomplicated, quick and easy to review, and most importantly such obvious improvements that there is no question about merging the change. A pet peeve of mine is PRs that include one excellent insta-merge change and an unrelated change that is controversial or requires significant rework. Keep PRs orthogonal, atomic, simple. It might be more work for you but if you are available to contribute you are not the time-poor party.