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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
Drill a whole in the front of the cooler for the rubber tube.
Step 2: Connect Cables
Drill a whole in the side of the cooler for the power and guitar cables.
Step 3: Insert the Amp
Push plastic tube through so that it touches the speaker grill on the amp.
Step 4: Hook Up the Amp
Place the amp in the center of the cooler and plug in the guitar cable and power.
Step 5: Add the Sound Insalation
Add stuffing all around the amp.
Step 6: More Sound Proofing
Try to find thick sound proof foam. This one a memory foam pillow.
Step 7: All Done Now Play
Close up the cooler and plug in your guitar.
Step 8: The Mic and the Talk Tube.
Check out this video to see it in action.