could it be that the MStereoExpander in MXXX acts different? I set up one MStereoExpander in MXXX and nothing else. Then I set up a MStereoExpander in my mixer chain and set up both MStereoExpander with the same values:
If I mute MStereoExpander and activate MXXX I can hear clearly a difference. If I mute MXXX and activate MStereoExpander there is no audible change in the audio signal.
So: does MStereoExpander behaves different inside MXXX?
Thanks for answers!
Edit:
Additional info: the input signal comes in MONO.

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