The RFM combines two video signals from the VIC-II to produce a composite signal, and an RF signal which contains audio. The extra frequencies to produce RF are known to bleed into the other signals, including Luma+Chroma (S-Video). This results in a general fuzziness to the screen, as well as horizontal blurring and dreaded "jail bars." ClearVideo64 uses a video buffer and cross filtering system with four controls, without the need for the RFM. In fact, it must be removed to access the left four pads. There are simple schematics that replace the RFM, combined with other kits that cross blend signals. But we were not satisfied! AndClearVideo64 was born