Currently, when making changes to the APO installation using the Configurator, the user is asked to reboot.
In my experience, this is unnecessary. Restarting the "Windows audio" service ("Audiosrv", which manages APOs and audiodg.exe) is enough.
In fact, sometimes it works without doing anything, especially if no sound devices were active for the past 30 seconds or so (the delay after which audiodg.exe automatically exits). However, that doesn't really matter, since restarting the service in that case will obviously not disrupt anything, so one might as well restart the service unconditionally.
Equalizer APO should simply restart the service by itself instead of asking the user to reboot. That would provide a smoother out-of-box user experience.
I took the liberty of writing a patch: https://github.com/dechamps/equalizerapo/commit/a0743fb1002902dd8d83dc1dff77bf054c0b8f13
The fix will be available in the next release.
Thank you all, who pour their coding wisdom and time into this!