Yessss! it opens a new unexplored way on Enterprise hardware. Observe how there aren't chips on the prototype, the electronics have been bypassed. The only ad-on is the 7805 regulator to produce +5v, and later a +5v to +- 12v converter. All the other leads connect directly to the correspondent Z80 bus Enterprise signals.
The magic here is how Prodatron has left (intentionally?) MSX code to access the device on the Enterprise port of SymbOS.
Also, the sound is injected directly to the Enterprise and it mix the stereo sound accordingly with the internal sound. What you hear is the Enterprise output sound.
One problem we, owners of Enterprise computers, suffer, is the "shortage" of hardware developers. This prototype proves that we can take advantage of other computer's hardware, and the MSX community is very active....
Now we are very near to enjoy a Yamaha V9990 graphics cartridge on our loved computer. Will it continue being an Enterprise? Probably! if someone creates an EXOS driver for it...
Don't you dream about a MIDI interface on the Enterprise....?