Chris,
It appears that the PNO Scan system emulates double escapement - yes? I have been wondering about that. That's great.
I suspect that Lanny means to play repeated notes, with the key return limited to 3/16" from the top. The note should repeat, without being damped inbetween repeats. Yes?
Some digital pianos emulate double escapement as well. Most Yamaha Clavinovas do, some newer Rolands do, and the entire new Casio Privia range also do. (My Casio PX-330 does, for example) However, I assume the PNO Scan system would be better. I would have to depress the key further than 3/16" for the virtual damper to be lifted on my Casio - it is not that precise. However, it does allow repetitions for small key returns (less than 50%). This is of course what the "tri-sensor" feature of the Casio action is all about - it has an additional sensor, between the top (note off) and bottom (note on) sensor - the additional sensor allows the shallower return repeats, and also allows these repeats to occur without damping.
I believe the most important aspect of double escapement is that it allows notes to repeat for relatively small key returns from the bottom. This allows rapid and soft trills. My piano book gives an example of a xylophonist starting a trill softly, and slowly increasing the strength of the trill. The mallets will start off very close to the instrument, and as strength is increased, the distance the mallets return also increases. If you watch the hammers as a concert pianist does the same thing on a grand piano, they will behave similarly.
EDIT: I've dug out some measurements I took from my Casio PX-330:
Total Key Travel: 11mm
Note-Off point: 6mm/55% release (that's over 7/16" from the top)
Partial-repeat release: 4mm/36% release
So, the double-escapement "partial repetition" band is only 2mm. Does that match a fine acoustic grand? I have to wonder.
Pianoteq seems to behave correctly in regards to double escapement repeats.
Greg.
Last edited by skip (10-10-2011 22:28)