The Extron FBI 100 Feedback Loop Isolator is designed to prevent potential feedback loops when a VCR is used for both recording and playback in an A/V system. As the VCR records signals through its A/V input, such as from a video camera and microphone, it outputs the same signals back into the system. The FBI 100 prevents the audio feedback loop, represented as a progressively loud tone that can occur if the VCR output signal is routed back into its A/V input via a switching system.