Here's the set up. Disklavier MIDI out to PC, PC running OMB, PC MIDI out to Disklavier.
Disklavier set to Quiet mode, Local "off" (so it doesn't make any sound of it's own when keys are pressed). This turns it into a really really expensive high quality weighted keyboard/MIDI controller. :-) Hit a key on the keyboard, it sends the MIDI to the PC, OMB sends the MIDI back to the Disklavier, and the Disklavier's tone generator makes noise. With that 500ms delay it was unplayable, with it off there is no perceived delay at all. (Mind you, this particular setup isn't all that interesting, but it displays the "delay" quite well).
Also, this has nothing to do with the "latency" that I was talking about earlier. That latency is when you use the computer to generate the sounds themselves (not just sending back MIDI).
-Kevin
From: Matthew Teeter
To: disklavier@yahoogroups.com
Sent: Wednesday, June 25, 2008 11:31:32 AM
Subject: Re: [disklavier] MarkIV MIDI via USB?
There is an obscure option to disable the 500ms delay that the
disklavier includes by default to account for the delay in the hammers. I cant remember where it is since I don't have a disklavier handy, but it was accessible through the PRC.
Kevin: Let see if I can explain myself.It is not clear to me wich is the latency problem, but try to use first MIDI OUT from the PC to the DKV and then Midi out from the DKV to the PC (or any) Midi IN (Thru mode) in this case the latency of the DKV (500 ms, half a second) will be handled by the DKV midi module before sending anyting to the Midi out port.2008/6/24 Kevin Goroway <kgoroway@yahoo. com>:Answering my own question, but I suppose the information should be here just in case anyone ever searches and finds this...
It works just fine. Connected the computer to the piano and it detected it fine. It wanted drivers. RTMF. It says so right in the Disklavier manual. They are available on yamaha's site, and work perfectly.
In my case, it didn't help the latency at all, but I'm fairly certain it's due to ancient hardware otherwise. The new computer (and slick soundcard) should be here in about a week, so I'll just have to use the piano's voices for now. :-)
-KevinSent: Tuesday, June 24, 2008 1:03:31 PM
Subject: Re: [disklavier] MarkIV MIDI via USB?Okay, but the question still remains...Does it work? Do you need drivers on the pc to see the disklavier as a MIDI device?
Also, although there's TONS more bandwidth available to USB, the question remains unanswered as to the latency to get through the USB stack on the PC...modern audio cards have latencies in the 2 ms range....can USB compete? I dunno.
Anyway, the point is somewhat moot (although I'm still interested in the answer) since I went and ordered an e-mu 0404 card for the new computer.
Thanks.
-Kevin----- Original Message ----
From: Mark Fontana t.net>To: disklavier@yahoogro ups.com
Sent: Tuesday, June 24, 2008 12:06:07 PM
Subject: Re: [disklavier] MarkIV MIDI via USB?
While the TO HOST cable is a tried-and-true solution, connecting to a
Mark IV via USB should offer considerably lower latency and improved
timing accuracy.
This is due, in part, to the bandwidth available:
MIDI wireline connection: 31250 bits per second
Serial TO HOST connection: 38400 bits per second
USB 1.1 connection: 12,000,000 bits per second
USB 2.0 connection: 480,000,000 bits per second
Even with the slight protocol overhead of USB, the volume of data
transmitted is about the same, so the benefit of the extra bandwidth is
huge. I have not seen any USB MIDI interfaces that actually connect at
USB 2.0 high-speed rates, though. Most support only USB 1.1, probably
for backwards compatibility with older computers. USB 1.1's bandwidth
is still enormous for this application.
Mark Fontana
On Tue, 24 Jun 2008, JORGE FERNANDEZ wrote:
> it seems to me that the best aproach would be an standard rs-232
> serial port and cable connected "TO host" port in the DKV (I assume
> this one extists in the DKV mark IV)
>
> This serial connection worked fine for me many years...
--
Saludos
Jorge Fernández
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