Did so, still the same error. Checking the Output-Plugin in DSP Studio does NOT survive restart of MC16. Direct Sound works as advertised including automatic change to the best supported format
Wave out just does not seem to care. Setting same as input does not give any error. Strange.
More strange: Trying wasapi event style after using automatic adjustment through direct sound the error message claimed it cannot output 24 bit data. I do not know if this was possible using ds, but 24 bit seems to have been the setting chosen by MC16 for ds and wave. It is not displayed in DSP Studio, instead the entry line is blank.
Even more strange: Changing dsp setting to 16 bit dithered AFTER going through all this now got for wasapi event style to output sound.
Maybe there is an easier way...