Hi @Andrew.J, sorry for the late reply -- we've been pretty busy with the new release of zenAud.io, which I'm happy to report is slated for next week!
With regard to MPE, I agree it would be a perfect fit for ALK. In fact, I think JUCE, which is the library we're using for a lot of the audio duties, exposes MPE functionality (after all ROLI, the company that makes JUCE, invented MPE!), so it ought to be reasonably simple. Hopefully sometime in the next month I'll get a free weekend (modulo kids and wife -- goes without saying) to make a deep dive into that subject matter.