COMM1: VFR Radio Simulator is a state-of-the-art CD-ROM that uses you personal computer's interactive capabilities to record and playback your own voice.   THIS IS THE BEST TRAINING AID TO COME ALONG IN DECADES!  in this Master CFIs Opinion.    Well designed and very comprehensive.  TheCD retails for about $100, but would cost you about $1000 in training from an instructor.  WORTH EVERY PENNY.   Good luck with your training.