In the patch pipo.ircamdescriptor.maxhelp:
If I click on SignalZeroCrossingRate under Signal Descriptors,
then click on the bang next to mubu.process,
click on the the tab ‘proc’
and then select the matrix view,
I see the results.
Now, if I click on TotalEnergy under Signal Descriptors,
the header in the matrix changes, but not the values.
That looks like a bug.
I have to click on clearall,
read the audiofile again,
click on the bang next to mubu.process,
click on the tab proc,
and select the matrix view to see the new values.