I have tried touching other components but there wasn't any difference.. I have rewired the whole thing and have given the LEDs, the potentiometer and the capacitor setup their separate ground pins. Still, I get no output and now only 2 of the LEDs produce sound when I touch them. The potentiometers are still not working. Here are some photos of the new setup: https://drive.google.com/folderview?id=0B-QIGqnDA9j2RWNSOHNvdDBmUGs&usp=sharing
P.S.: The pins of the potentiometers weren't fitting through the holes of the breadboard so I used pliers to make them smaller. I have included a photo of the modified pins in the link. I hope this doesn't affect anything.
Kind Regards,
Calin Baciu