Kevin, Disklavier models that have hammer sensors are designed to ensure that hammer velocity on playback is correct. Over time, there is wear and tear on the action parts that result in subtle changes to the relationship between key speed and the resulting hammer speed. When you do a calibration on a Disklavier that has hammer sensors, the instrument checks the current state of that relationship and makes adjustments as necessary.
If you run a Disklavier for hours at a time, there can be other slight changes to the mechanics of the system as a result of heat build up. The Disklavier PRO has sensors that continuously monitor what is going on inside the piano, and the instrument can make subtle adjustments in real time.
You may find a video that I created on this topic to be of interest:
It's on the middle of the page of the Disklavier Education Network website and is called Understanding the Disklavier PRO.
Regards,
PianoBench
On Apr 14, 2014, at 5:08 PM, Kevin Weng wrote:
The problem is fixed. The technician did a calibration.I learned something new today. I thought the recording should be a black or white thing: either you recorded it or not. However it seems the sensors and recording part is more analogous than digital. The accuracy of recording is not binary 1 or 0. It is subject to a lot of factors like temperature, moisture level. The keys can move sluggish or the replay can be sluggish. It is like the sound can be out of tune and requires regular tuning.Anyone knows more about the consistency and reliability of the recording can add more?KevinOn Fri, Apr 11, 2014 at 12:12 PM, Bill Current Gmail <bill.brandom03@...> wrote:
My suggestion is to have your piano calibrated. If this doesn't fix the sensing problems on those two keys, then have him check the key and hammer shutters, they are probably damaged or missing.
BillI am record ing my practice and realize there are 2 keys not being recorded:
#D 1 octave up and
E 2 octave downFor existing recording that has these two keys it play fine, like the fantasie impromptu in the demo library.
Any idea? I have the service technician comes next Monday but wonder anyone has seen similar problem?
Kevin