[highstream]

Yes, that's been my idea so far, since it's so easy to convert and I'm dealing with different kinds of files from a variety of sources. I mean no offense to calibre's developer(s); I'm just more focused on using what's on my Kindle and adjusting that as need be than developing a calibre library or learning its command line structure, which for me will rarely be worth the return (there's always the public library and I like reading and listening to books).