$ cd /Applications/Pianoteq\ 4/Pianoteq\ 4.app/Contents/MacOS/
$ ./Pianoteq\ 4 --help
Pianoteq version 4.2.0/20120919 -- http://www.pianoteq.com
Copyright (c) 2012 Modartt.
Options from command-line:
--help            : show this help, and quit
--version         : show current version number and date, and quit
--no-prefs        : start Pianoteq without using any saved preference
--no-audio-prefs  : start Pianoteq with a clean audio/midi configuration
--prefs FILENAME  : stores the preferences in the specified file
--fxp FILENAME    : load an FXP file on startup
--preset NAME     : load a preset on startup
--list-presets    : display the list of all presets
--midimapping NAME: load a midimapping preset on startup
--midi FILENAME   : load a midi file
--wav FILENAME    : export midi file as wav, and quit
--rate FREQ       : change the sample rate for the exported wav
--bit-depth D     : change the bit-depth for the exported wav (16,24 or 32)
--mono            : export the wav file as mono
--headless        : do not show the graphical interface
--play            : immediately start playing the midi file
--play-and-quit   : start playing the midi file, and quit when it ends
Example of use: Pianoteq --preset "M3 Close Mic" --midi foo.mid --wav foo.wav