It is possible that your mixtremecard misunderstod the digital sync from a Tascam breakoutbox. The problem is that this breakoutbox doesn´t use the T-DIF standard. To solve that problem you can change your configuration inside the mixtrememixer as follows:
- choose "ignore incomming samplerate"
- MasterClock set to "T-DIF A"
- choose the samplerate that you are want to use
Notice: Please don´t forgett to save the the mixersettings. Otherwise the changes are lost when you reboot the system