Best WAV Editng Software GUI Based

[Cammy]

For converting and editing smaller samples, like for games or application alert type sounds, I use SoundBox. I guess if you have enough RAM you can use it for larger samples too. In any case I've used it a lot and it does the job well for me.

http://aminet.net/package/mus/misc/SoundBox
http://aminet.net/package/mus/misc/SoundBoxKey

If you can get copies of the commercial software mentioned previously they'd probably be much better suited though.