Guitar Input not working Alesis Multimix 8 usb FX

So I have tried plugging in a guitar into input 2 with the guitar button pushed down and the volume all the way up but I cannot hear the guitar being played at all. I have also tried plugging in mics and aux cables and I can hear sounds from them perfectly fine on the same input. Just the guitar is not working. I have tried Multiple different cables for it with no luck.
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