The Appsys ProAudio SRC-128 is an optional hardware module designed to enhance the MVR-64 mkII Multiverter by providing up to 128 channels of bidirectional, asynchronous sample rate conversion between arbitrary sample rates and interfaces. This functionality allows seamless integration of audio equipment operating at different sample rates without requiring a common master clock, thereby simplifying complex digital audio setups. The SRC-128 supports flexible channel assignments, accommodating configurations from 128x0 to 0x128 channels in blocks of 16 when both sides operate at standard rates. It achieves up to 64x64 channels at double-speed rates and up to 32x32 channels at quad-speed rates, ensuring compatibility with a wide range of professional audio equipment.