Custom tank music plays fast: tried soundcache stuff

[Dominator_101 =HKC=]

So, I was trying to make custom tank music. I made it a wav, pretty sure I made it the right wav format, and packaged it up.

Unfortunately, it plays at about double speed (as it's about twice the normal tank music length). I tried doing the snd_buildcachefordirectory (or whatever) to give the directory a sound cache file, packaged it up, still didn't work. I figured before I gave up I would try the snd_rebuildsoundcache (I'm doing these by memory, so they might not be exact), even though I don't know if that would help it work if I put it on the workshop. ERven that didn't work. The sound still plays fast.

What the heck am I doing wrong? I've tried everything that I can think of, and tried pretty much everything I found while googling the issue to no avail.