Normally I use Audirvana>AcourateConvolver>Merging Anubis. It does not work with AS, which sees the dac as a 3ch dac and smash my AcourateConvolver setup which normally is a 4ch setup.
Let me reply myself. The reason here is the Merging MAD driver which should be adjusted to the 4ch I use in maximum khz. The Audirvana 3.5 was not sensible to this.