I have then IO setup with a microphone and the used box is checked. I have a track with that microphone as the input. I have signal. I have the fat channel affecting the sound of the input on the board in the headphone mix. I do not see the fat channel above the insert in the studio one inputs as I’ve seen in videos. Therefore i cannot link onboard dsp and studio one’s fat channel. I see no mention of the used boxin the manual page 15 IO setup but it seems to have to do with usb routing according to a post i read.