AUDIO REPAIR If the leakage is as loud or louder than the main signal, audio repair software can help. iZotope RX, Steinberg SpectraLayers, and Waves noise reduction plugins use spectral processing to sort out unwanted elements. These tools can work well, and sometimes spectacularly well, but the processes can be labor intensive and introduce unwanted artifacts which can be occasionally even worse A recording with embedded leakage selected to be removed in iZotope RX7http://www.recordingmag.com/sound-advice