Hi, been trying my hand at the voice changing megaphones and I have a couple quick questions:
-I've got a circuit verrry similar to the cm2 schematic, but it's laid out a bit different and the parts aren't numbered...when to remove 'resistor R7' what exactly is that doing and how can I find the similar resistor on my megaphone? 
-I can get the pitch to go higher by touching the two ends of the clock speed resistor w/ a wet finger, but for some reason connecting a pot (10K, tried 250ohm, 1k, 10k, 50k, 250k, 500k, &amp; 1m) does not work...any idea of what I'm doing wrong here?
-Any chance of putting up a schematic for the megaphones that have a row of 5 switches on the side (labeled a-e)? Seem to be quite common, I've had trouble getting the pitch on those (and fired two), and I'd be interested to see what you've done with them.
Thanks a lot! You are the shit!