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Reviews around port work (5.00 of 5)
QH-U-M7 MIDI USB Interface - 4 In/4 Out (4X4 USB MIDI) Splitter/Controller/Synthesizer Music BOX (MIDI Merge Box)
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I bought this because it seemed to indicate that it could work in several modes that did not require a computer (the manual also confirmed this) but my unit had many issues where some ports worked and some didn't
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