How to test custom sounds?

[Wuzzy]

So, I've got some sounds, that I like to use to replace the OpenSFX sounds with. But I have no idea how to actually use or test the sounds in OpenTTD. Can someone please show me if I need to use any tool or whatever? And where do I need to put the files when I'm done?

I'm on GNU/Linux btw.

[Wuzzy]

OK, I figured it out now. I turns out you need a tool called "catcodec" which is on some OpenTTD-related repository.