Help, when replacing ambience on level in SP, new sound effect .wav is not audible

[MusicForThePiano]

The ambience on the SP levels sucks so I thought I would try to replace them with other ones, for example yavin_ext yavin_ext_rain are pretty bland, I've updated other ones like hoth_ext and hoth_cave, city_lp (which only appears in the mp/ctf4 coruscant map background ambience, not the t2_rogue one which I want it to, but every time I put a replacement sound effect for the rest in a pk3 in the base, they don't play in SP. Why is this?

[Circa]

Probably not the right format. Looped files need to be mono WAV files, I believe.