Macro Steps for Normalizing Multiple M4A Files

[roy.axford]

I am writing about using the 'Normalize -1dB' macro to operate on all 31 M4A files in a directory.
I used the 'Manage Macros' dialogue (under Tools/Macros...) to set it up.
I added 'Normalize -1dB' to the 'Select Macro' window.
In the 'Edit Steps' window I used three steps as follows:
01 Normalize -1dB (Macro_Normalize-1dB)
02 Export as WAV'
03 - END -
Importing all the files is accomplished using 'Apply Macro to: Files...' and selecting all the files.
This also launches the macro process. (No 'are you sure', it just goes.)
When finished, there was a new subfolder in my original folder called 'macro-output' with 62 WAV files as follows:
- filename.wav and filename001.wav... 31 pairs like this.
I opened the first two files with Audacity and I couldn't see any difference between them.
Can someone please explain why the original number of files is multiplied by 2 in 'macro-output'?
What is the purpose of the '001' versions?

[steve]

Perhaps you accidentally applied it twice?
If you run the Macro again on the same files, you will get 002 versions as well.