Hi Oleg
The Alpha's design was driven largely by ergonomics, bearing in mind the engineering restrictions of putting a large number of keys near the hands of a musician. It wasn't designed with any particular type of music in mind, it was designed to be as expressive as humanly possible while remaining playable to a beginner. After we had spent countless days thinking about musical layouts, scales, fingerings and all that stuff we realised that we genuinely had no idea what it should really be, hence the extreme configurability (which many have take exception to as it turns out, people woiuld lile to just be told how to play it). The idea was that you, the musicians, would over time figure this out for yourselves and whatever particular style you played in. So far this is slowly coming true, many of you have developed and shared different layouts and I think we'll see some standardisation in time.
The polyphonic expression aspect of the instrument is actually one of the easier things to both understand and play. You can quite easily learn to bend notes within a chord, to bend the whole chord or add vibrato. Guitarists do this stuff all the time, so this isn't a big surprise. If you come from a monophonic instrument or ordinary keyboards it might seem a bit weird, but to those of us who started out on six strings it all seems very reasonable. I bend notes within chords, bend whole chords and vibrato them all the time on the guitar.
I love to see the innovation with layout that goes on, one of those will probably end up at the 'Eigenharp standard' in the end, just like EADGBE did on the guitar.
John