Not an April fool’s joke 
Sometimes is nice to play in mono to be even more expressive, it allows the player to animate melodies with things like legato and trills.
But I’ve noticed that trying to play mono synth patches with expressive controllers (LinnStrument in my case) lead to challenges. The biggest issue happens when doing a trill/hammer-on: as soon as the new note takes priority, the note pressure value drops from the sustained level of the previous note to zero for the new note.
It would be nice if MPE controllers had a “mono mode”. How would you define it? Do you have any work around? I wonder if I can configure my expert sleepers FH-2 to do it.
I think it would be nice for the MPE controller to have a mono mode, so that the synthesizer doesn’t need to care. I would design it to be similar to guitar (since that’s my background), where the highest pitch takes priority. And to avoid the issue with dropping pressure, I would read the pressure values of every note and output the highest. If the player does a hammer-on I would maintain the current note and jump to the new pitch using a pitch bend message.