Mr.st.andy wrote:The situation with curves is that if the curve is changed in Pianoteq it has priority over the curve Kawai VPC1. If the curve is not set in Pianoteq - working curve Kawai VPC1.
Sorry, but this part is just wrong (maybe a problem in the translation...): The curve set in the VPC-1 changes the midi velocity values sent by the instrument, so changing that curve will always affect the values seen by Pianoteq. The curves set in Pianoteq are then applied to the midi values received, so in fact both curves have an effect on the outcome. If you do not want to bother creating an individual curve in Pianoteq, you might find setting the VPC-1 to the built-in curve for Pianoteq preferable (I personally didn't). Oh, and just in case: in order for the VPC-1 to retain changes to its internal settings, it has to be switched off with its power button once after making the changes. If you use a switchable power strip, be sure to not switch that off first when you've changed the VPC-1's setup or it may lose the changes and you will be wondering why things don't work as expected the next time.
One other thing to note, though, is that the note-off velocity curve in Pianoteq should probably be adjusted: for one, Pianoteq can handle note-off values to 127, but the VPC-1 only delivers values up to 100. More importantly (depending on what and how you play), Pianoteq (at least this is still the case with the Linux 5.2.1 version) does not actually interpret very small note-off velocities as a "note-off" (on the VPC-1, it is possible to reproducibly release a key slow enough to get a note-off velocity of 1, which you can verify in the MIDI monitor under Options>MIDI), so the lower end of the note-off velocity curve should be moved up to correct this behavior.
On your second question, newbert, you are right that the curve will not change from normal playing (that would be quite a nuisance, too - luckily the information from the other forum is incorrect). Can't offer much on questions 3 or 4, except to at least confirm that using a Midi connection, I noticed no perceivable difference in latency between the VPC-1 and an older Yamaha keyboard.
Hope this helps,
Daniel