Hmm. I would imagine it is possible to some extent; but, I have to admit that I am not an expert in audio production. I took up Orecchiette mostly as a challenge to my coding skills; I believed I could do better than the "Recaller" app. But for the most part, Orecchiette is pretty much just a glorified front-end to a collection of GStreamer pipelines.

For "AAC", Orecchiette is using the "nokiaaacenc" GStreamer plugin, and this is another problem -- I can't find any documentation at all for this plugin. I am setting two parameters for it, "bitrate" (to 128000) and "output-format" (to 1), but only because I stole those parameters from the Recaller app. I honestly don't know what values are viable for these parameters (or for that matter, their exact function, although "bitrate" seems fairly obvious).

In any case, though, I have long needed to clean up the Orecchiette GUI, so I wouldn't mind at least making these items available on the preferences panel. Let me take a look at it...