I was more interested in their unit that comes with 41 piano keys and 120 bass buttons. It's on Master's website, but not where you,d expect to find it. You have to click the "News" tab to find it.
So far, I've received nothing from Master re: specs, and I asked twice. But they did tell me that there are two models -- one has their Play Midi sound module (400 sounds, just like the one in my accordion) and the other doesn't. The price difference between the two models is significant.
I guess I could use either as a midi controller, but what turns out to be more than $1000 US for the model without the sound module and more than $2000 US for the one with the sound module (both prices include shipping to the US) is an expensive guess. Let's face it, I already have a 49-key midi controller keyboard that cost a lot less than $1000 US. But the idea of inputting midi data for my DAW or my notation program with automatic major, minor, 7th and dim with the press of one button intrigues me. I could also use my accordion to input midi data but I find that sitting at my computer with its cable, power box, etc. nearby is inconvenient, to say the least. That's why I'd love to have one of those keyboards.
Oh, well, I guess I'd just have to wait some more.