Disklavier

PianoBench:

Yours is a very interesting reply.  I'll be curious to learn someday, 
while externally recording the Pro's greater volume of XP data, just how 
much inaccuracy is typically introduced due to the bottlenecking of the 
MIDI stream to the external computer.

I assumed incorrectly that models later than the Mark II were incapable 
of recording internally and simultaneously outputting a MIDI stream. 
One day when I've replaced my Mark II with a Pro, I'd like to try making 
measurements of the timing inaccuracies added by the queuing of MIDI data.

Before doing so, however, it would nice to learn what degree of timing 
inaccuracy is detectable by astute listeners. Also, realizing that there 
are inevitable variations among perfectly fine performances of the same 
piece by the same artist, the quest for ever greater accuracy in 
recording becomes, at some point, overkill.

PianoBench@... wrote:
> Good morning, everyone.
> 
> In a message dated 1/31/04 4:33:55 PM, Bob writes:
> 
>> It would be helpful, for comparison, if one could simultaneously record
>> a performance both internally and to SONAR3. You have surely found that
>> the DKV will not support that.
> 
> 
> Actually, on a Mark IIXG or later Disklavier that has record and MIDI 
> Out capabilities, you can do this.
> 
> What you will find is that there are small timing discrepancies between 
> the events that are recorded internally and those that are recorded 
> externally. I presume that this discrepancy is a result of the fact that 
> there is no time-stamping in a live MIDI data stream. In other words, 
> when you send MIDI data down a MIDI cable, you can only send one event 
> at a time, and each event has to wait for its turn to be sent. The more 
> dense the MIDI data stream, the more discrepancies there will be.
> 
> When you record to the interal disk drive or memory of the Disklavier, I 
> presume that the instrument has an opportunity to record the actual 
> timing of each event to disk as it occurs. During playback from disk, 
> the Disklavier similarly has the advantage that it can read the timing 
> of each event in the file as opposed to respond to each event as it is 
> received from an external source.
> 
> So, I must conclude that the most accurate recordings are made when you 
> record internally and that the most accurate playback occurs when you 
> play back from an internal source. Having said that, I don' think  that 
> most people will notice the timing discrepancies that you get when you 
> record or playback using an external sequencer. In fact, it has been 
> Yamaha's practice in the US to create its solo piano recordings by 
> recording into the computer.
> 
> Regards,
> PianoBench
> 
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-- 
Robert Welcyng
Anchorage, Alaska