I have a Soundcraft Signature 10 mixer. It's not digital, but it has a USB 2.0 in, like the Flow 8. I lost some of the intro to my songs (like one beat of the count in), that's been an issue for some of us. Probably the USB-C to USB 2.0 cable causing it. I had to go for a USB-C to 3.5 mm minijack connection instead. Avoid the power saving ones, they will give you a delay too. Just giving you a heads up since you seem to be using all your ins on the FLOW 8 leaving you no spare for ST3 in case the USB doesn't work.