How about Cake's Pyro?  It is $20 and it says- it converts to MP3 and publishes, burns CDs and so on. May be it is better than native CD maker inside of Sonar? It does not tell much in a store. http://www.store.cakewalk.com/b2cus/ProductInfo.aspx?productid=10-CWAC1.00-10E

The Cakewalk encoder is a commercially licensed version of LAME

More accurately the Cakewalk encoder is a licensed version of the MP3 encoding technique to which the Fraunhofer Institute, claims a patent. Lame is an independent implementation of the encoding technique, which may infringe that patent. Hence the rather strange behavior on the part of the Lame ("LAME Ain't an MP3 Encoder") Lame developers to only distribute source code  in an attempt to avoid infringement action that they apparently expect would be more successful against compiled versions. The argument seems to be analogous to the distinction between distributing the blueprints for a mousetrap as opposed to manufacturing and distributing the mousetrap itself.

In any case the Fraunhofer and Lame MP3 implementations are not identical, although the resulting compressed audio works pretty much the same, and each version has its fanboys.

I found AIFF, thanks, but it asked me "suboptions" if I want 8, 16, 32 and so on bit signed/unsigned PCM. I have no idea what that is, so I chose 16 bit signed PCM, and it did it, but I can not test it. So I have to put the file in a drop box for the play producer, and if it does not work- we will look bad- I will look bad. Oh well. Is it a setting I needed?

Relax. The signed 16-bit option is probably the safest one you could have chosen. The target application will almost certainly be able to use it.

Thank you much. learning something every time. :)

I downloaded and compiled Lame some years back. I have batch file ont he desktop that I copied from the compile folder. I just drag 16 bit wavs onto the batch file and drop them and Lame creates MP3s of the files in the same directory as the wav. I'm very happy with this solution. I once did some stuff to enable me to export from Sonar as mp3, but I never use that method. I just export the 16 bit wav and convert using my batch. I can multiselect and drop on the batch too. So if I want to convert 20 files, I just drag all twenty to the batch file.

Of course, you would use 24bit wavs if you had them. There is no need to dither 24bit wavs to 16bit if the are destined to be mp3 encoded.

Yes.  16 bit just for burning CDs. 

The problem is- I dont know where to download LAME as the links not working.

I do not need to export as 16 bit for MP3?

For lame, I had to download source and compile it. See if you can Google this. You can use the c#compiler that comes with c#express. Not sure if there isn't an easier way. I own programming tools so it was easy for me to compile lame. For some reason (legal? ) the source is distributed rather than the executable.