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Mono Duplicators 'or' Summing cables. These are bi-directional cables and will work to replicate a signal or sum together two signals. In most instances Duplicating or Splitting an audio signal is straight forward and is easily done with a simple cable. Summing two unbalanced audio signals together can be more complex and may require circuitry to do it correctly. We can build circuitry into cables on request. If you need any advice, please do not hesitate to contact us.