Using native audio backend without SDL backend installed causes noticable delay

[huantianad]

I created a quick test app using brick that simply toggles the playing state of an audio file whenever you push a key. https://github.com/huantianad/proteaaudio-test

When I run this app either

• importing the SDL backend (import Sound.ProteaAudio.SDL)
• importing the native backend (import Sound.ProteaAudio) while proteaaudio-sdl is included in my cabal build-depends
  the music play/pauses basically immediately when I push a key.

However, if I import the native backed, and don't include proteaaudio-sdl in my build-depends, there's a small delay between pushing a key and the music pausing.

Is this because the native backend has some sort of delay, and including proteaaudio-sdl in my build-depends is somehow causing my program to use the SDL backend instead?

Linux kernel 6.6.1, Pipewire 0.3.84.