Hi Dave,
I have just added reverb and a Echo DSP to the Mic channel (using fx block 20) then embedded them in a MIDI on my Genos .
Now, when it loads, it sets up the effects, but at the end of the song it does not change them or disable them, so they stay active until you do something that changes them.
However whenever I turn on 'Talk' using the panel button, neither reverb or Echo are applied to the Mic channel, which is what you would expect! So I don't know why you don't get the same result!
What firmware version is installed in your Genos? If you are using an early version perhaps there was a bug in it. Mine is ver. 1.41, which is currently the latest, but there is a new version ver. 2 expected to be released tomorrow (Friday 15th November).
Regards
Ian