Command line scripting with SoX and create a batchfile

first time poster and absolute AutoIt beginner.... please be gentle! I'm trying to write a script to automate the Sox tool to convert a .ul file to .wav en when done delete the .ul file.

But this must be done for a whole disk with directory's. So I like todo this with a script or batchfile.

So what I do now is the following just for one file:

sox -r 8000 -c 1 E:\directory\date\127\call\20120629.ul E:\directory\date\127\call\20120629.wav

So a script that search into all directory's and convert to /wav en delete when ready the .ul file (don't worry, we have a backup)

The .wav file must be in the some directory as the original file.