I recently aquired a studiolive 24.4.2. Not the AI model. All channels work as designed except channel. 5. I get signal showing on the 1st LED bar and can adjust the sensitivity but i get no output to the mains. I have tried assigning to different subs, mains etc. adjusting gate etc. and get nothing. What am i missing. Is there a reset i can try. I dont care about any previous stored scenes. Thanks for any info.