Add wind effect to a custom song.

The wind SFX you hear in the intro in Narshe is a song itself. I don't know how many channels it use, maybe one or two, but you would need that many empty channels and copy $C955DB-$C956C4 wind song data into those empty channels of your song. I think you should also sync the end of both song so as in an example your song does not play for 50 seconds and the wind channels end at 35 seconds. But this could maybe not be really relevant in the case of a wind SFX.

Edit: I'm not 100% sure the "Dark World Wind SFX" is same as "Intro Wind SFX" but the principle would remain the same, extract the wind channel(s) from Dark World and insert them in your song.