I wouldn't do it.
I think 970s mic input is bad enough for one mic.I had it for a month to try it out. Returned it last week.
I mean not that you can't do it.Now you have two signals fighting for gain. What are you trying to do?
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MIKIMIKI
TYROS 5,BEHRINGER X32PRODUCER,YAMAHA DSR112,JBL PRX618s XLF,EV ZLX12p,SENNHEISER E945,....ETC