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Microsoft wants Edge to automatically open by default every time you turn on your Windows 11 PC
(www.windowscentral.com)
This is a most excellent place for technology news and articles.
Bit specific, but for opening an audio device other than default, you should use the API of a sound server. Pulseaudio's for instance. The new hotness is Pipewire, and it has its own API, but it also supports the Pulseaudio API and AFAWK most clients (apps and things) are still using that.
The sound server sits on top of ALSA and handles all the routing and mixing and shit. ALSA is lower level than what you need as an app/user program dev.
(Pipewire also supports the JACK API. Music apps and such used to use JACK because it was lower latency than Pulseaudio. Which meant you had to stop Pulse and start JACK and lose all sound from your other apps and it was a right pain. Pipewire just does both.)
-- Frost