I have a Presonus Studio 1810C. I have a Mac Mini M1 connected to the USB-C port. I use Input 1 through 3, Input 4 with Fender Bass Amp; Input 5 & 6 with Fender GT100 Amp; Input 7 & 8 with a Roland FA-06 Keyboard. Connected to the main out are two JBL Studio Monitors. One of the functions I use the 1810C for is to play music or videos on the Mac and play along using my instruments. The problem I am having is the volume of the USB-c input from the Mac is very loud so when I adjust the volume using the Main volume to a comfortable level for the Mac, I can't hear the instruments. What am I doing wrong? The Mac does not allow me to adjust the volume level and I'm not seeing anyway to adjust the volume with the UC panel. Any help would be greatly appreciated.