Question

I am nOOB I have a synth connected to ch 9 and 10. Why would sound also be coming in on Ch 1 and 6?

Please help

Thanks

Answer 1

Probably you have routed channels 9 and 10 additionally to channels 1 and 6. This is called digital split. You can send one channel multiple times to other input channels. UC_Surface_ReferenceManual_EN_04042019, section 9.6.2 "Input Patch". You find the manual in the download area of your mixer.