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Here are the instructions to making a guitar talk box out of a battery powered amp and an igloo cooler.
You need the following
1 small guitar amp
1 small cooler
1 Rubber Tubing
Guitar or keyboard, a Guitar cord, amp and Mic
Step 1: Connect Tube
Step 2: Connect Cables
Step 3: Insert the Amp
Step 4: Hook Up the Amp
Step 5: Add the Sound Insalation
Step 6: More Sound Proofing
Step 7: All Done Now Play
Step 8: The Mic and the Talk Tube.
Check out this video to see it in action.