"MRX/MTX series" signal processor and "XMV series" power amplifier, which allow flexible and simple construction of sound systems requiring complex signal control and large numbers of inputs and outputs, have now been updated to version 3.3, further improving connectivity, expandability, and ease of use for these units. This update allows the head amps of the MRX7-D and MTX5-D to be controlled from a CL/QL series unit and the functions have been added to expand the functional potential of the MTX/MRX/XMV series, enhance system operability, and shorten design and installation time.