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If the software you're using can read from a pair of channels other than the CH1 1/2 input, then yes, you can assign it to any / all of them:

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Olá, gostaria de saber se consigo selecionar REC OUT para CH2,CH3 ou CH4, pois somente funciona no CH1, os demais mesmos selecionados no Setting Utility não funcionam. Já atualizei o firmware.
Obrigado,
Renato
(DJM-850)
If the software you're using can read from a pair of channels other than the CH1 1/2 input, then yes, you can assign it to any / all of them:

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