Use the Lame Encoder and follow the instructions:
The LAME encoder is FREE and even Scott R. Garrigus, or was it Craig Anderton, well one of them wrote an article on how to configure Sonar to use the Lame MP3 encoder. Also, when you upgrade, from an earlier version of Sonar and allow Sonar to copy its settings, the MP3 settings are copied to the next version as well.
Follow these directions:
If you don't want to unlock(buy) the cakewalk mp3 encoder, you can invoke the Lame mp3 encoder directly from SONAR 3, 4, 5. With this you don't need to first export to wav and then encode to mp3. Remember that the Lame mp3 encoder is high quality, open source and free.
Download and install the lame 3.96.1 (STABLE) encoder.
~~~~> HERE <~~~~~ If you want to select your own version of a Lame encoder, download from the
~~~> LAME ENCODER SITE <~~~~ Instructions: Open SONAR 3, 4, 5 and go to Tools -> Cakewalk Ext. Encoder Config.
In the Friendly Name Field write: Lame Mp3 Encoder.
In the Extension field write: .mp3
In the Description field write whatever you want.
In the Path field write the path where the Lame encoder is located. That is where lame.exe and lame_enc.dll are located. I keep my Lame encoder in my C:\Program Files\Cakewalk\Shared Utilities\Lame Folder or (copy and past the extracted zip file to your Sonar shared utilities folder and then when you have to perform this step, click the browse button to find the location.
In the Command Line field write: lame -b 192 -m j %I %O
Press Save button.
Uncheck Keep Wave File.
This will export to a 192Kbps, joint stereo mp3 file. If you want 128Kbps, replace 192 with 128 in the Command Line field. The next time you click on File->Export->Audio in SONAR 3, 4, 5 you'll find 'Lame mp3 encoder' as a type of audio.
Hope this helps,
Peace