Hi, I have to work on an old project on an old Mac Pro with Sierra 10.12 and an old version of Digital Perform (DP8). Last time this setup was used (quite a while back), everything worked fine. The RME audio out still works fine, but not the audio input. There is no sound or sign of audio input in DP, or on the RME totalmix, and no audio can be heard. The green light flashes on the RME 400 input 3, where the instrument is plugged in, and the Mac itself shows that the audio is entering the Mac (I can see the bar rise and fall when the instrument is played). But audio input is not showing up in DP or in the RME Totalmix and it cannot be heard on the speakers. I checked the Mac settings and RME is the input and output source. I checked the RME settings and the Channel 3 is set to a good input level. I have the latest update of the RME driver compatible with Sierra. Any ideas what's wrong? Thanks for your help.