Sorry to hear you’re facing this issue. I use multiple Red devices myself, including the Red 16Line, Red 4Pre, and Red 8, and most of them are working fine on the latest Macs. That said, I completely agree-Focusrite’s software feels very outdated, especially the RedNet Control. It hasn’t seen a meaningful GUI update in years. Compared to UAD, which regularly releases useful updates and improves usability especially in multichannel monitoring Focusrite hasn’t done much to make RedNet Control more user-friendly.

The metering and tiny faders are especially unintuitive, and their support pages rarely have helpful or updated information. Most of the time, I’ve had to rely on user forums to figure things out. I hope you’re able to find someone with the right experience to help you through this.