I had no problem with cds because they were sterio. However, when making .wav files of mono casette tapes I used gramofile and then oggenc. Then I realized that the resulting ogg and wav files were, of course, still mono. I thought maybe I could use the sox "split" option to convert such files, but other than the mention of "split" in the manpages, couldn't figure out how to use it. can anybody tell me how to do this? Thanks.