is there a plugin, i think FS plugin would do a trick, that has a option to only accept audio files to be copied to, and when they are copied to it, it automaticaly compresses them with audio codec that is preselected to preselected location.
And of course, has some queue..
I think that packer plugin would not be as flexible as FS plugin because you can browse directories and add files to queue as you come along them...
A bit specific (understatement

Thanks is advance!