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archlinux-proaudio
Actively maintained binary package repo for Arch Linux of free and open source pro-audio software.
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InfluxDB
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If you are interested in surgext in the repositories, feel free to provide it in the AUR as a start and maybe also reach out to osam-cologne/archlinux-proaudio who are working on the preparation of several packages for inclusion. Other recommended resources are #archlinux-proaudio on libera.chat and the arch-proaudio mailing list.
The surge package is in fact not out-of-date. Version 1.9.0 is the last/latest version of surge. On a somewhat similar post I answered with this which might fit your question to some extent as well.
The surgext releases that follow surge's last release are (according to upstream) a rewrite and should be considered a new piece of software (yet they live in the same code repository :S). If you have a look at the PKGBUILD for surge, you will see, that it requires a few fixes to even start dealing with reproducibility etc. which means that this is usually something requiring more time to get right as a package, which would likely also be the case with its successor. Additionally, the replacement scenario is kind of unclear (surgext is not compatible with surge, yet it is its direct successor).