The Audioaccess CPC800 is the key to restore or expand an existing Audioaccess whole-house audio system. The CPC-800 accepts the input from up to 6 KPS-101 keypads and converts RS-485 control language, used to communicate with older Audioaccess control units like the PX-600 and PX-700, to RS-232 commands understood by the PX-800. The new system can be expanded to have up to 16 zones with control of the legacy and new zones performed by 3rd party control system including URC, RTI, Crestron, and IP while local control of the legacy zones is still available from the existing KPS-101 in-room keypads.