Just to let you know that TechTool couldn’t find the deleted files. It seems that under a UNIX like Mac OS X, there’s no hope for undeletion unless you are already using a utility that caches trashed files (which defeats the purpose of trashing files to regain disk space).
So I’m left with the option of living with the surviving mix, or re-recording. Right now I don’t have the time to record, and I can’t bring myself to post the existing mix online. So you’ll have to wait until I make up my mind to hear the song…