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Hey, we’re having a problem with using myMix and hum in our mains. When we connect a mic and an instrument to the same myMix unit we get a hum in our main speakers. We use myMix as a monitor system and do not send a signal from myMix to our sound board. We use y-connectors to send audio from a mic – one line to myMix, one to the audio board. I suspect that there is some sort of cross-talk going on in the y-cables creating a hum. Any ideas? Should we be using a spliter instead?