Step 2Modify the damn things
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...both in the same way. One walkie talkie will be the transmitter, plugged into the instrument, and one will be the receiver, plugged into the amplifier. Open the walkie-talkies and look for the speaker/microphone (same thing). There should be two wires running to the speaker/microphone. Use a soldering iron to soften the solder holding these wires in place and remove the wires from the speaker/microphone. These wires will need to be joined to your 1/4" audio outs for both walkie-talkies. Run these new audio outs through a hole drilled in the plastic housing of the unit. Be sure to provide enough slack in these new cables to reach the amplifier, in the case of the receiver, or the instrument, in the case of the transmitter. Solder all the new connections securely, and insulate and secure the connection with hot glue. A good, secure connection will ensure that the signal is as clean (in a lo-fi sense) as possible.
http://www.radioshack.com/sm-45-watt-desoldering-iron--pi-2062731.html