I've had a couple people ask how I'm making my singing pumpkins so I thought I'd start a new thread. Note that it's still coming together, so these are by no means my final attempt. As always comments are greatly welcome.
First, you will need VSA by brookshiresoftware, a KIT 74 (parallel or serial doesn't matter), and a WAV or MP3 of the music you want to play. I'll use This is Halloween as an example but you need to record just the vocal portion of the track. I used Audacity for this which is a free audio software tool. Follow this thread for some good tips:
http://www.halloweenforum.com/showthread.php?t=60671
The reason for this is VSA will pick up the music and vocal tracks and the end result will not look like the pumpkins are singing. Here comes the fun part. Once you have this plain vocal track (don't worry nobody but you will ever here it) Load it into VSA and run the wavemotion analysis. Now you should have distinct pulses that match the original song. Simply load the original WAV/MP3 back into VSA and you should now have the original song with distinct pulses.
You'll have to play it a couple times and make minor changes but for the most part, it should be very close. This is 75% of the work. The rest is wiring the KIT 74 to lights and cutting up the pumpkins which I haven't gone into great detail at home yet.
The KIT 74 will support up to 8 pumpkins, skulls, etc.
Z