Not sure if this is how you did it, but it seems to be part of the missing link.  My workaround involves creating Aux Tracks off of the TTS-1 Track and assigning them to the TTS-1 Outputs. From there I just moved the FX plug-ins to the TTS-1 Output Tracks.  So far, no crashes, but I only have 2 or 3 plug-ins on each of three TTS-1 Outputs. It seems that with my workaround, I now have what you described here (using Cakewalk instead of PatchMix): So, thanks for helping to le