[Steam] Audio Issues with Mass Effect 1 When Using Headphones

I am using the steam legendary edition on steam

I initiate by activating my headphones and accessing the legendary edition launcher, where audio functions correctly. However, upon selecting 'resume' to continue Mass Effect 1, the game unexpectedly routes its audio output to my speakers instead of the headphones. Interestingly, this issue seems isolated to the game itself; external audio sources, such as YouTube videos, continue to play through the headphones if I minimize the game. This peculiar behaviour persists even when returning to the game, with its audio steadfastly playing through the speakers.