To use the MCAudio tool, do the following:
Choose a name for the output file in the Output File edit box. (The tool selects a default name at startup.)
In the Input Files area, select input files for one or more audio channels. You don t have to specify a file for every channel; blank channels are simply not written into the file. For example, you can make a 5.1 file by leaving out the back center channel.
Use the Output File Type radio buttons to switch between .wav file output and audio .avi file output.
Click the Do It! button to write the file. A progress bar indicates the progress of the write operation.