Retrieve Memos off ipod
I'm not 100% on this but I think you can use something like this software called iBrowse that will allow you to view files from your Mac or PC. Assuming the recording is not somewhere in the restricted portion of the file structure, you can get it from there. The file should be .AAC format. 

Another way, again assuming you have access to where it was saved, is to use disk mode to browse the files. Apple has a nice support page on that so I won't elaborate: Disk Mode

Hope that helps!