There seems to be a problem in the command response text file.. the following two lines have typos and do not match the .wav filenames.. I believe some of you may not be getting a response under these two conditions..
IGN_NAV_VR_SET_COURSE my_voicepack/setting_couse.wav
USA_NAV_VR_SET_COURSE my_voicepack1/setting_couse.wav
Simply edit the file to say course instead of couse
If this gets corrected in the download section, someone should post a note here to let others know its fixed..