INTRODUCTION Congratulations, and thank you for your purchase of the RFX ABC904 Route 3 switcher. This unit was designed and manufactured to provide years of faithful service. Please review this manual carefully - so you have a proper understanding of the operation of your new ABC904. The ABC904 is a versatile unit that works as a signal distribution device by taking a single stereo or mono signal input, and switching it to up to three stereo outputs.