The MIDI Solutions MultiVoltage Quadra Merge merges all MIDI messages appearing at its four MIDI inputs to its two MIDI outputs. All MIDI message types are merged, including System Exclusive, MIDI Clock, and MIDI Time Code messages. A fast merging algorithm ensures that all MIDI data is processed accurately with the minimal possible delay. The Quadra Merge is MIDI-powered, and requires no batteries or power supply to operate with most MIDI products (for more information read the Power FAQs). A MIDI indicator LED lights up when the product is powered and flashes when MIDI data passes through it. MIDI Solutions MultiVoltage products are compatible with both the original 5V and new 3.3V MIDI specifications, for more information read the MultiVoltage FAQ.