OPTIONS:
convert: Actually convert the wav to m4a.
verbose: Show the commands that will be run.
play: Play the converted files, with minimum play time of 12s. You can override this value with an environment variable called MIN_PLAY_TIME.
check: Run some basic sanity checks on the input file (afclip).
Passing no options is the equivalent of 'itunes-convert convert verbose play check'
Options can be negated, as well: 'itunes-convert -check -verbose'