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REMOVABLE PLUG-IN DEVICE FOR CONVERTING AND AUDIO SIGNAL OR SIGNALS AND FOR TRANSFERRING THE SIGNALS TO A PHYSICALLY SEPARATE RECORDING/PLAYBACK DEVICE, SUCH PLUG-IN DEVICE COMPRISED OF A MICROPHONE, A SWITCH, AN ELECTRICAL CONTACT AND ELECTRONIC CIRCUITRY FOR CONNECTING THE MICROPHONE THROUGH THE ELECTRONIC CIRCUITRY TO THE ELECTRICAL CONTACT WHEREBY WHEN THE PLUG-IN DEVICE IS PLUGGED INTO ELECTRICAL CONNECTION WITH A RECORDING/PLAYBACK DEVICE, THE RECORDING/PLAYBACK DEVICE MAY BE PROVIDED WITH A RECORDABLE ELECTRICAL SIGNAL OR SIGNALS