added a check against already playing sound to the audio playback test
enabled touch response and blinking for the demo
increased range of detection for audio playback to a little over a foot
moved touch sound to a constant at the top of the file. reduced delay time between range triggers to around 2 seconds. changed the delay timer to not start counting down until the triggered sound has finished playing
changed the range triggered sound files to ROBOBIZ#
added a sixth sound file name to the array
increased the size of the sndFiles array to 9 characters since they must be null terminated. increased the delay timer back up to 2000 since the HAPPY1 sound has 1 second of silence that I didn't know about and was increasing my delay test estimate