Yamaha DSP-RX Rivage Series Mix Engine (120 Inputs / 48 Mix Outputs / 24 Matrix)The DSP RX is a powerful DSP engine that serves as the core for signal processing and system control required for the RIVAGE PM system. DSP RX can be upgraded to DSP RX EX later by adding the DEK DSP RX kit. Features: Compatible Control Surfaces: CS R10, CS R10 S, CS R5, CS R3 Superior capability of processing digital audio signals of up to 120 input, 48 MIX, 24 MATRIX, and two STEREO channels. Four HY card slots that are capable of transmitting